Appointment of Steve Lucas as a Non-executive Director and retirement of David Williams

Steve Lucas was Finance Director at National Grid plc from 2002 to 2010 and has significant expertise in energy and power, infrastructure finance and treasury. Previously, he worked for 11 years at Royal Dutch Shell and for six years at BG Group, latterly as Group Treasurer. Steve is currently a Non-executive Director of the drilling company Transocean Ltd and retired last year as a Non-executive Director of Compass Group plc where he was chairman of the audit committee. It is intended that Steve will be appointed as Chairman of Tullow’s audit committee with effect from 16 May 2012.

David Williams will retire from the Board of Tullow and as chairman of the Audit Committee on 16 May 2012 after the Annual General Meeting. David has served as a Director for almost six years and has been a valued member of the remuneration and nominations committees. The Board would like to thank him for his substantial contribution over this period.

There are no further disclosures required under Rule 9.6.13 of the Listing Rules of the UKLA and 6.6.7 of the Listing Rules of the Irish Stock Exchange in respect of Mr Lucas to those disclosed above.