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  • Glossary

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    Glossary

    A

    AGM

    Annual General Meeting

    AFS

    Available for sale

    B

    bll

    Barrel

    bcf

    Billion cubic feet

    boe

    Barrels of oil equivalent

    boepd

    Barrels of oil equivalent per day

    bopd

    Barrels of oil per day

    C

    CMS

    Caister Murdoch System

    CMS III

    A group development of five satellite fields linked to CMS

    CR

    Corporate Responsibility

    CSO

    Civil Society Organisation

    CNOOC

    China National Offshore Oil Corporation

    D

    DLT

    Development Leadership Team

    DoA

    Delegation of Authority

    DRC

    Democratic Republic of Congo

    DSBP

    Deferred Share Bonus Plan

    E

    EA

    Exploration Area

    E&E

    Exploration and evaluation

    E&A

    Exploration and Appraisal

    E&P

    Exploration and Production

    EBITDA

    Earnings Before Interest, Tax, Depreciation and Amortisation

    EHS

    Environment, Health and Safety

    EMS

    Environmental Management System

    ERC

    Energy Resource Consultants

    ESOS

    Executive Share Option Scheme

    F

    FEED

    Front End Engineering and Design

    FPSO

    Floating Production Storage and Offloading vessel

    FRC

    Financial Reporting Council

    FRS

    Financial Reporting Standard

    FTG

    Full Tensor Gravity Gradiometry

    FTSE 100

    Equity index whose constituents are the 100 largest UK listed companies by market capitalisation

    FVTPL

    Fair Value Through Profit or Loss

    G

    GELT

    Global Exploration Leadership Team

    GNPC

    Ghana National Petroleum Corporation

    GoU

    Government of Uganda

    Group

    Company and its subsidiary undertakings

    H

    H&S

    Health and Safety

    HIPO

    High Potential Incident

    HNBS

    Hewitt New Bridge Street

    HR

    Human Resources

    I

    IAS

    International Accounting Standard

    IASB

    International Accounting Standards Board

    IFRIC

    International Financial Reporting Interpretations Committee

    IFRS

    International Financial Reporting Standards

    IMS

    Information Management System

    ISO

    International Organization for Standardization

    K

    km

    kilometres

    KPI

    Key Performance Indicator

    L

    LIBOR

    London Interbank Offered Rate

    LTI

    Lost Time Incident

    LTIFR

    LTI Frequency Rate measured in LTIs per million hours worked

    M

    mmbbl

    Million barrels

    mmbo

    Million barrels of oil

    mmboe

    Million barrels of oil equivalent

    mmscfd

    Million standard cubic feet per day

    MoU

    Memorandum of Understanding

    MTM

    Mark To Market

    N

    NGO

    Non-Governmental Organisation

    O

    OR&A

    Operational Readiness and Assurance

    P

    p

    pence

    P10

    Reserves and/or resources estimates that have a 10 per cent probability of being met or exceeded

    P50

    Reserves and/or resources estimates that have a 50 per cent probability of being met or exceeded

    P&D

    Production and Development

    PAYE

    Pay As You Earn

    PRT

    Petroleum Revenue Tax

    PSC

    Production Sharing Contract

    PSP

    Performance Share Plan

    S

    SCT

    Supplementary Corporation Tax

    SIP

    Share Incentive Plan

    SMC

    Senior Management Committee

    SPA

    Sale and Purchase Agreement

    sq km

    Square kilometres

    SRI

    Socially Responsible Investment

    T

    toes

    Tullow Oil Environmental Standards

    TSR

    Total Shareholder Return

    U

    UK GAAP

    UK Generally Accepted Accounting Principles

    V

    VAT

    Value Added Tax

    W

    WAEP

    Weighted Average Exercise Price

    WCTP

    West Cape Three Points

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Accounting policies

Year ended 31 December 2010

Tullow Oil plc is a company incorporated in Great Britain under the Companies Act 2006. The address of the registered office is given on the contacts page. The nature of the Group’s operations and its principal activities are set out in the operations review and finance review sections.

In the current year, the following new and revised Standards and Interpretations have been adopted and have affected the amounts reported in these financial statements.

Standards not affecting the reported results or the financial position

The following new and revised Standards and Interpretations have been adopted in the current year. Their adoption has not had any significant impact on the amounts reported in these financial statements but may impact the accounting for future transactions and arrangements.

Amendment to IFRS 3 (2008) Business Combinations, IAS 27 (2008) Consolidated and Separate Financial Statements and IAS 28 (2008) Investments in Associates

These standards have introduced a number of changes in the accounting for business combinations when acquiring a subsidiary or an associate. IFRS 3 (2008) has also introduced additional disclosure requirements for acquisitions. These changes have had no impact on these financial statements because the Group has not effected any business combinations or investments in associates during 2010.

Amendment to IFRS 2 Share-based Payments

IFRS 2 has been amended, following the issue of IFRS 3(2008), to confirm that the contribution of a business on the formation of a joint venture and common control transactions is not within the scope of IFRS 2.

Amendment to IAS 17 Leases

IAS 17 has been amended such that it may be possible to classify a lease of land as a finance lease if it meets the criteria for that classification under IAS 17.

Amendment to IAS 39 Financial Instruments: Recognition and Measurement

IAS 39 has been amended to state that options contracts between an acquirer and a selling shareholder to buy or sell an acquiree that will result in a business combination at a future acquisition date are not excluded from the scope of the standard.

IFRIC 17 Distributions of Non-cash Assets to Owners

The Interpretation provides guidance on when an entity should recognise a non-cash dividend payable, how to measure the dividend payable and how to account for any difference between the carrying amount of the assets distributed and the carrying amount of the dividend payable when the payable is settled.

IFRS 2 (amended) Group Cash-settled Share-based Payment Transactions

The amendment clarifies the accounting for share-based payment transactions between group entities.

At the date of authorisation of these financial statements, the following Standards and Interpretations which have not been applied in these financial statements were in issue but not yet effective (and in some cases had not yet been adopted by the EU):

IFRS 9 Financial Instruments
IAS 24 (amended) Related Party Disclosures
IAS 32 (amended) Classification of Rights Issues
IFRIC 19 Extinguishing Financial Liabilities with Equity Instruments
IFRIC 14 (amended) Prepayments of Minimum Funding Requirement

Improvements to IFRSs (May 2010)

The adoption of IFRS 9 which the Group plans to adopt for the year beginning on 1 January 2013 will impact both the measurement and disclosures of financial instruments.

The Directors do not expect that the adoption of the other standards listed above will have a material impact on the financial statements of the Group in future periods.

The financial statements have been prepared in accordance with International Financial Reporting Standards (IFRSs) as issued by the International Accounting Standards Board (IASB). The financial statements have also been prepared in accordance with IFRSs adopted by the European Union and therefore the Group financial statements comply with Article 4 of the EU IAS Regulation.

The financial statements have been prepared on the historical cost basis, except for derivative financial instruments that have been measured at fair value. The principal accounting policies adopted by the Group are set out below.

Following its announcement on 6 July 2010, Tullow Oil plc (the Company, together with its subsidiaries, the Group) has changed its presentational currency from sterling to US dollars with effect from 1 January 2010, due to the majority of oil revenues and costs being dollar-denominated. These are the first financial statements to be presented in US dollars and all comparative information has been restated in accordance with the requirements set out in IAS 21, The Effects of Changes in Foreign Exchange Rates with respect to translation of results to presentational currency:

  1. assets and liabilities denominated in non-US dollar currencies were translated into US dollars at the closing rate prevailing at the balance sheet dates;
  2. non-US dollar income and expenses were translated into US dollars at an exchange rate which approximates to the exchange rate ruling at the date of transactions; and
  3. all resulting exchange rate differences have been recognised in other comprehensive income, within the foreign currency translation reserve.

In light of the ever-increasing operations of the Group being conducted in US dollars and the majority of the Group’s external funding being provided in US dollars the Directors have reviewed the functional currency of Tullow Oil Plc (Company only) and have concluded that it is appropriate for the functional currency of the Company to be converted from sterling to US dollars (effective date of 1 January 2010).

The financial statements have been prepared on a going concern basis (see note 17 for further details).

The consolidated financial statements incorporate the financial statements of the Company and entities controlled by the Company (its subsidiaries) made up to 31 December each year. Control is achieved where the Company has the power to govern the financial and operating policies of an investee entity so as to obtain benefits from its activities.

Non-controlling interests in the net assets of consolidated subsidiaries are identified separately from the Group’s equity therein. Non-controlling interests consist of the amount of those interests at the date of the original business combination and the non-controlling share of changes in equity since the date of the combination. Losses applicable to the non-controlling interest in excess of the non-controlling interest’s share in the subsidiary’s equity are allocated against the interests of the Group except to the extent that the non-controlling interest has a binding obligation and is able to make an additional investment to cover the losses.

The results of subsidiaries acquired or disposed of during the year are included in the Group income statement from the effective date of acquisition or up to the effective date of disposal, as appropriate.

Where necessary, adjustments are made to the financial statements of subsidiaries to bring the accounting policies used into line with those used by the Group.

All intra-group transactions, balances, income and expenses are eliminated on consolidation.

Business combinations

The acquisition of subsidiaries is accounted for using the purchase method. The cost of the acquisition is measured at the aggregate of the fair values, at the date of exchange, of assets given, liabilities incurred or assumed and equity instruments issued by the Group in exchange for control of the acquiree, plus any costs directly attributable to the business combination. The acquiree’s identifiable assets, liabilities and contingent liabilities that meet the conditions for recognition under IFRS 3 are recognised at their fair value at the acquisition date, except for non-current assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 non-current assets held for sale and discontinued operations, which are recognised and measured at fair value less costs to sell. Goodwill arising on acquisition is recognised as an asset and initially measured at cost, being the excess of the cost of the business combination over the Group’s interest in the net fair value of the identifiable assets, liabilities and contingent liabilities recognised. If, after reassessment, the Group’s interest in the net fair value of the acquiree’s identifiable assets, liabilities and contingent liabilities exceeds the cost of the business combination, the excess is recognised immediately in the income statement or in income or expense.

Joint ventures

The Group is engaged in oil and gas exploration, development and production through unincorporated joint ventures. The Group accounts for its share of the results and net assets of these joint ventures as jointly controlled assets. In addition, where Tullow acts as operator to the joint venture, the gross liabilities and receivables (including amounts due to or from non-operating partners) of the joint venture are included in the Group balance sheet.

Non-current assets (or disposal groups) classified as held for sale are measured at the lower of carrying amount and fair value less costs to sell. Non-current assets and disposal groups are classified as held for sale if their carrying amount will be recovered through a sale transaction rather than through continuing use. This condition is regarded as met only when the sale is highly probable and the asset (or disposal group) is available for immediate sale in its present condition. Management must be committed to the sale which should be expected to qualify for recognition as a completed sale within one year from the date of classification.

Sales revenue represents the sales value, net of VAT and overriding royalties, of the Group’s share of liftings in the year together with tariff income. Revenue is recognised when goods are delivered and title has passed.

Revenues received under take-or-pay sales contracts in respect of undelivered volumes are accounted for as deferred income.

Interest income is accrued on a time basis, by reference to the principal outstanding and at the effective interest rate applicable, which is the rate that exactly discounts estimated future cash receipts through the expected life of the financial asset to that asset’s net carrying amount.

Lifting or offtake arrangements for oil and gas produced in certain of the Group’s jointly owned operations are such that each participant may not receive and sell its precise share of the overall production in each period. The resulting imbalance between cumulative entitlement and cumulative production less stock is ‘underlift’ or ‘overlift’. Underlift and overlift are valued at market value and included within debtors and creditors respectively. Movements during an accounting period are adjusted through cost of sales such that gross profit is recognised on an entitlements basis. The Group’s share of any physical stock, warehouse stock and materials is accounted for at the lower of cost and net realisable value.

Inventories are stated at the lower of cost and net realisable value. Cost is determined by the first-in first-out method and comprises direct purchase costs, cost of production, transportation and manufacturing expenses. Net realisable value is determined by reference to prices existing at the balance sheet date.

The US dollar is the presentation currency of the Group. For the purpose of presenting consolidated financial statements, the assets and liabilities of the Group’s non USD denominated operations are translated at exchange rates prevailing on the balance sheet date. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuate significantly during that period, in which case the exchange rates at the date of transactions are used. Currency translation adjustments arising on the restatement of opening net assets of non US dollar subsidiaries, together with differences between the subsidiaries’ results translated at average rates versus closing rates, are taken directly to reserves. All resulting exchange differences are classified as equity until disposal of the subsidiary. On disposal, the cumulative amounts of the exchange differences are recognised as income or expense.

Transactions in foreign currencies are recorded at the rates of exchange ruling at the transaction dates. Monetary assets and liabilities are translated into US dollars at the exchange rate ruling at the balance sheet date, with a corresponding charge or credit to the income statement. However, exchange gains and losses arising on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur, which form part of the net investment in a foreign operation, are recognised in the foreign currency translation reserve and recognised in profit or loss on disposal of the net investment. In addition, exchange gains and losses arising on long-term foreign currency borrowings which are a hedge against the Group’s overseas investments, are dealt with in reserves.

The Group adopts the successful efforts method of accounting for exploration and appraisal costs. All licence acquisition, exploration and evaluation costs and directly attributable administration costs are initially capitalised in cost centres by well, field or exploration area, as appropriate. Interest payable is capitalised insofar as it relates to specific development activities. Pre-licence costs are expensed in the period in which they are incurred.

These costs are then written off as exploration costs in the income statement unless commercial reserves have been established or the determination process has not been completed and there are no indications of impairment.

All field development costs are capitalised as property, plant and equipment. Property, plant and equipment related to production activities are amortised in accordance with the Group’s depletion and amortisation accounting policy.

Commercial reserves are proven and probable oil and gas reserves, which are defined as the estimated quantities of crude oil, natural gas and natural gas liquids which geological, geophysical and engineering data demonstrate with a specified degree of certainty to be recoverable in future years from known reservoirs and which are considered commercially producible. There should be a 50 per cent statistical probability that the actual quantity of recoverable reserves will be more than the amount estimated as proven and probable reserves and a 50 per cent statistical probability that it will be less.

All expenditure carried within each field is amortised from the commencement of production on a unit of production basis, which is the ratio of oil and gas production in the period to the estimated quantities of commercial reserves at the end of the period plus the production in the period, generally on a field-by-field basis. Costs used in the unit of production calculation comprise the net book value of capitalised costs plus the estimated future field development costs. Changes in the estimates of commercial reserves or future field development costs are dealt with prospectively.

Where there has been a change in economic conditions that indicates a possible impairment in a discovery field, the recoverability of the net book value relating to that field is assessed by comparison with the estimated discounted future cash flows based on management’s expectations of future oil and gas prices and future costs. Where there is evidence of economic interdependency between fields, such as common infrastructure, the fields are grouped as a single cash generating unit for impairment purposes.

Any impairment identified is charged to the income statement as additional depletion and amortisation. Where conditions giving rise to impairment subsequently reverse, the effect of the impairment charge is also reversed as a credit to the income statement, net of any depreciation that would have been charged since the impairment.

Provision for decommissioning is recognised in full when the related facilities are installed. A corresponding amount equivalent to the provision is also recognised as part of the cost of the related property, plant and equipment. The amount recognised is the estimated cost of decommissioning, discounted to its net present value, and is reassessed each year in accordance with local conditions and requirements. Changes in the estimated timing of decommissioning or decommissioning cost estimates are dealt with prospectively by recording an adjustment to the provision, and a corresponding adjustment to property, plant and equipment. The unwinding of the discount on the decommissioning provision is included as a finance cost.

Property, plant and equipment is stated in the balance sheet at cost less accumulated depreciation and any recognised impairment loss. Depreciation on property, plant and equipment other than production assets is provided at rates calculated to write off the cost less estimated residual value of each asset on a straight-line basis over its expected useful economic life of between three and five years.

Borrowing costs directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale, are added to the cost of those assets, until such time as the assets are substantially ready for their intended use or sale.

Finance costs of debt are allocated to periods over the term of the related debt at a constant rate on the carrying amount. Arrangement fees and issue costs are deducted from the debt proceeds on initial recognition of the liability and are amortised and charged to the income statement as finance costs over the term of the debt.

Costs of share issues are written off against the premium arising on the issues of share capital.

Current and deferred tax, including UK corporation tax and overseas corporation tax, are provided at amounts expected to be paid using the tax rates and laws that have been enacted or substantially enacted by the balance sheet date. Deferred corporation tax is recognised on all temporary differences that have originated but not reversed at the balance sheet date where transactions or events that result in an obligation to pay more, or right to pay less, tax in the future have occurred at the balance sheet date. Deferred tax assets are recognised only to the extent that it is considered more likely than not that there will be suitable taxable profits from which the underlying temporary differences can be deducted. Deferred tax is measured on a non-discounted basis.

Deferred tax is provided on temporary differences arising on acquisitions that are categorised as Business Combinations. Deferred tax is recognised at acquisition as part of the assessment of the fair value of assets and liabilities acquired. Any deferred tax is charged or credited in the income statement as the underlying temporary difference is reversed.

Petroleum Revenue Tax (PRT) is treated as an income tax and deferred PRT is accounted for under the temporary difference method. Current UK PRT is charged as a tax expense on chargeable field profits included in the income statement and is deductible for UK corporation tax.

Contributions to the Group’s defined contribution pension schemes are charged to operating profit on an accruals basis.

The Group uses derivative financial instruments to manage its exposure to fluctuations in foreign exchange rates, interest rates and movements in oil and gas prices.

Derivative financial instruments are stated at fair value.

The purpose for which a derivative is used is established at inception. To qualify for hedge accounting, the derivative must be ’highly effective’ in achieving its objective and this effectiveness must be documented at inception and throughout the period of the hedge relationship. The hedge must be assessed on an ongoing basis and determined to have been ’highly effective’ throughout the financial reporting periods for which the hedge was designated.

For the purpose of hedge accounting, hedges are classified as either fair value hedges, when they hedge the exposure to changes in the fair value of a recognised asset or liability, or cash flow hedges, where they hedge exposure to variability in cash flows that is either attributable to a particular risk associated with a recognised asset or liability or forecasted transaction.

In relation to fair value hedges which meet the conditions for hedge accounting, any gain or loss from re-measuring the derivative and the hedged item at fair value is recognised immediately in the income statement. Any gain or loss on the hedged item attributable to the hedged risk is adjusted against the carrying amount of the hedged item and recognised in the income statement.

For cash flow hedges, the portion of the gains and losses on the hedging instrument that is determined to be an effective hedge is taken to equity and the ineffective portion, as well as any change in time value, is recognised in the income statement. The gains and losses taken to equity are subsequently transferred to the income statement during the period in which the hedged transaction affects the income statement or if the hedge is subsequently deemed to be ineffective. A similar treatment applies to foreign currency loans which are hedges of the Group’s net investment in the net assets of a foreign operation.

Gains or losses on derivatives that do not qualify for hedge accounting treatment (either from inception or during the life of the instrument) are taken directly to the income statement in the period.

Leases are classified as finance leases whenever the terms of the lease transfer substantially all the risks and rewards of ownership to the lessee. All other leases are classified as operating leases and are charged to the income statement on a straight-line basis over the term of the lease.

Assets held under finance leases are recognised as assets of the Group at their fair value or, if lower, at the present value of the minimum lease payments, each determined at the inception of the lease. The corresponding liability to the lessor is included in the balance sheet as a finance lease obligation. Lease payments are apportioned between finance charges and reduction of the lease obligation so as to achieve a constant rate of interest on the remaining balance of the liability. Finance charges are charged directly against income, unless they are directly attributable to qualifying assets, in which case they are capitalised in accordance with the Group’s policy on borrowing costs.

The Group has applied the requirements of IFRS 2 Share-based Payments. In accordance with the transitional provisions of that standard, only those awards that were granted after 7 November 2002, and had not vested at 1 January 2005, are included.

All share-based awards of the Group are equity settled as defined by IFRS 2. The fair value of these awards has been determined at the date of grant of the award allowing for the effect of any market-based performance conditions. This fair value, adjusted by the Group’s estimate of the number of awards that will eventually vest as a result of non-market conditions, is expensed uniformly over the vesting period.

The fair values were calculated using a binomial option pricing model with suitable modifications to allow for employee turnover after vesting and early exercise. Where necessary, this model was supplemented with a Monte Carlo model. The inputs to the models include: the share price at date of grant; exercise price; expected volatility; expected dividends; risk free rate of interest; and patterns of exercise of the plan participants.

All financial assets are recognised and derecognised on a trade date where the purchase or sale of a financial asset is under a contract whose terms require delivery of the investment within the timeframe established by the market concerned, and are initially measured at fair value, plus transaction costs.

Financial assets are classified into the following specified categories: financial assets ‘at fair value through profit or loss’ (FVTPL); ‘held-to-maturity’ investments; ‘available-for-sale’ (AFS) financial assets; and ‘loans and receivables’. The classification depends on the nature and purpose of the financial assets and is determined at the time of initial recognition.

Cash and cash equivalents comprise cash on hand and demand deposits and other short-term highly liquid investments that are readily convertible to a known amount of cash and are subject to an insignificant risk of changes in value.

Trade receivables, loans and other receivables that have fixed or determinable payments that are not quoted in an active market are classified as loans and receivables. Loans and receivables are measured at amortised cost using the effective interest method, less any impairment. Interest income is recognised by applying the effective interest rate, except for short-term receivables when the recognition of interest would be immaterial.

The effective interest method is a method of calculating the amortised cost of a financial asset and of allocating interest income over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash receipts (including all fees on points paid or received that form an integral part of the effective interest rate, transaction costs and other premiums or discounts) through the expected life of the financial asset, or, where appropriate, a shorter period.

Income is recognised on an effective interest basis for debt instruments other than those financial assets classified as at FVTPL. The Group chooses not to disclose the effective interest rate for debt instruments that are classified as at fair value through profit or loss.

Financial liabilities and equity instruments are classified according to the substance of the contractual arrangements entered into.

An equity instrument is any contract that evidences a residual interest in the assets of the group after deducting all of its liabilities. Equity instruments issued by the Group are recorded at the proceeds received, net of direct issue costs.

Other financial liabilities, including borrowings, are initially measured at fair value, net of transaction costs. Other financial liabilities are subsequently measured at amortised cost using the effective interest method, with interest expense recognised on an effective yield basis. The effective interest method is a method of calculating the amortised cost of a financial liability and of allocating interest expense over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash payments through the expected life of the financial liability, or, where appropriate, a shorter period.

Details of the Group’s significant accounting judgements and critical accounting estimates are set out in these financial statements and include:

  • Carrying value of intangible exploration and evaluation fixed assets (note 9);

    Where a project is sufficiently advanced the recoverability of intangible exploration assets is assessed by comparing the carrying value to internal and operator estimates of the net present value of projects. Intangible exploration assets are inherently judgemental to value and further details on the accounting policy is included in accounting note (j). The amounts for intangible exploration and evaluation assets represent active exploration projects. These amounts will be written off to the income statement as exploration costs unless commercial reserves are established or the determination process is not completed and there are no indications of impairment. The outcome of ongoing exploration, and therefore whether the carrying value of exploration and evaluation assets will ultimately be recovered, is inherently uncertain.

  • Carrying value of property, plant and equipment (note 10);

    Management perform impairment tests on the Group’s property, plant and equipment assets at least annually with reference to indicators in IAS 36. Key assumptions in the impairment models relate to prices that are based on forward curves for two years and the long-term corporate assumptions thereafter and discount rates that are risked to reflect conditions specific to individual assets.

  • Commercial reserves estimates (note 10);

    Proven and probable reserves are estimated using standard recognised evaluation techniques. The estimate is reviewed at least twice annually and is regularly reviewed by independent consultants. Future development costs are estimated taking into account the level of development required to produce the reserves by reference to operators, where applicable, and internal engineers.

  • Presumption of going concern (note 17);

    The Group closely monitors and manages its liquidity risk. Cash forecasts are regularly produced and sensitivities run for different scenarios including, but not limited to, changes in commodity prices, different production rates from the Group’s portfolio of producing fields and delays in development projects. The Group normally seeks to ensure that it has a minimum ongoing capacity of $500 million for a period of at least 12 months to safeguard the Group’s ability to continue as a going concern.

    The major assumption in current cash flow forecasts is that the receipt of disposal proceeds from the Uganda farm-down, which have been delayed longer than expected, will now be received in Q2 2011. On this basis, the Group’s forecasts, taking into account reasonably possible changes as described above, show that the Group will be able to operate within its current debt facilities and have very significant financial headroom for the 12 months from the date of the approval of the 2010 Annual Report and Accounts. However, in the unlikely event that the Ugandan farm-down process is delayed beyond Q2 2011, the Directors are confident that the Group can manage its financial affairs, including the securing of additional funding, agreement with existing lenders, portfolio management and deferring of non-essential capital expenditure, so as to ensure that sufficient funding remains available for the next 12 months.

    After taking account of the above, the Directors have a reasonable expectation that the Group has adequate resources to continue in operational existence for the foreseeable future. Accordingly, they continue to adopt the going concern basis in preparing the Annual Report and Accounts.

  • Derivative financial instruments (note 18);

    The Group’s derivative financial instruments are marked to market.

  • Decommissioning costs (note 20);

    The costs of decommissioning are reviewed twice annually and are estimated by reference to operators, where applicable, and internal engineers.

    During 2010 a review of all decommissioning estimates was undertaken by an independent specialist and the 2010 financial statements now include estimates in accordance with this study.

    Provision for environmental clean-up and remediation costs is based on current legal and constructive requirements, technology and price levels.

  • Recoverability of deferred tax assets (note 20).

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