Seismic Survey Update

Borders & Southern Petroleum plc 20 September 2005 Strictly embargoed until: 0700, 20 September 2005 Borders & Southern Petroleum plc Seismic Survey Update Borders & Southern Petroleum plc ('Borders & Southern' or 'the Company') (AIM: BOR), the international oil and gas exploration and production business, announces that, having completed the acquisition of 2862 km of 2D seismic data within its licensed acreage in the South Falkland Basin, it has received the processed data from Geophysical Services Incorporated and commenced interpretation. A preliminary review of the high quality seismic lines has confirmed the presence of a major fold and thrust belt with its associated foreland basin within the Company's acreage. These seismic lines reveal considerably more structures than originally anticipated and include numerous large anticlines, tilted fault blocks and sub-thrust structures capable of trapping significant volumes of hydrocarbons. The data also reveals seismic amplitude anomalies associated with many of the structures. The Company anticipates that the seismic interpretation will be completed before the end of the year and will focus on the definition and mapping of prospects and leads, with an assessment of their hydrocarbon potential. A full operational update will be given when this interpretation is completed. Commenting on the announcement, Howard Obee, Chief Executive of Borders & Southern, remarked: 'Although these early indications are by no means conclusive, we are very encouraged about the prospectivity of the Company's acreage. We look forward to the completion of the full evaluation of the seismic data later this year.' For further information please contact: Howard Obee Richard Sunderland / Chief Executive Clemmie Carr Borders & Southern Petroleum plc Tavistock Communications Tel: 020 7661 9348 Tel: 020 7920 3150 Notes to Editors B&S was formed as a public limited company in June 2004. At that time, the Company submitted an application for its first project, offshore exploration acreage (19,598 square kilometers) in the South Falkland Basin, southeast of the Falkland Islands. The Company was subsequently granted five production licenses by the Governor of the Falkland Islands with effect from 1 November 2004. This information is provided by RNS The company news service from the London Stock Exchange