1. HRS GeoLogic Ltd, 1 Windmill Place, East Challow OX12 9RT, UK
2. CASP, 181a Huntingdon Road, Cambridge CB3 0DH, UK
3. HM Research Associates, 2 Clive Road, Balsall Common, West Midlands CV7 7DW, UK
4. Dana Petroleum plc, King's Close, 62 Huntly Street, Aberdeen AB10 1RS, UK