Guyane Update

WESSEX EXPLORATION PLC

(AIM: WSX)

Guyane Update

Wessex Exploration PLC ("Wessex" or "the Company") notes the Interim Management Statement of Tullow Oil PLC ("Tullow") made today in respect of progress on the Guyane Maritime block, in which Wessex holds an effective 1.25 per cent. interest, which included the following statement:

"In French Guiana, the Zaedyus exploration well discovered 72 metres of net oil pay in two turbidite fans. This is the first well in Tullow's extensive Guyana Basin acreage and successfully proved the Jubilee play extends from West Africa across the Atlantic to the new basin. Currently, a sidetrack is being drilled to recover reservoir cores with operations expected to complete in mid-November. The partners are working on the 2012 programme and anticipate it to include 3D seismic and the drilling of two wells which is expected to commence in mid-2012 once all the necessary approvals have been obtained. Shell is expected to take over Operatorship of the block in early 2012, subject to Government and Joint Venture approval."

Frederik Dekker, Wessex's Managing Director, commented today:

"Wessex is very pleased to be associated with the Zaedyus discovery announced in September. 2012/13 will be a busy period for the partnership and we look forward to playing a full part in the future work programme and sharing in the resulting success."