| ADURA OPERATIONS LIMITED | ADURA ENERGY |
| AKER BP UK LIMITED | AKER BP ASA |
| ALKANE ENERGY UK LIMITED | INFINIS ENERGY |
| ALTA QUEST ENERGY CORPORATION (UK) LIMITED | BRITNRG LIMITED |
| ALTWOOD PETROLEUM LIMITED | ALTWOOD PETROLEUM |
| ANASURIA HIBISCUS UK LIMITED | HIBISCUS PETROLEUM |
| ANGUS ENERGY WEALD BASIN NO.3 LIMITED | ANGUS ENERGY |
| APACHE BERYL I LIMITED | APACHE CORPORATION |
| APACHE NORTH SEA LIMITED | APACHE CORPORATION |
| ARCO BRITISH LIMITED, LLC | BP EXPLORATION |
| ATHENA EXPLORATION LIMITED | ATHENA EXPLORATION LIMITED |
| AURORA ENERGY RESOURCES LIMITED | AURORA PETROLEUM |
| BG INTERNATIONAL LIMITED | SHELL PLC |
| BLACKLAND PARK EXPLORATION LIMITED | BRITNRG LIMITED |
| BOWLAND RESOURCES (NO.2) LIMITED | SPIRIT ENERGY |
| BOWLAND RESOURCES LIMITED | SPIRIT ENERGY |
| BP EXPLORATION (ALPHA) LIMITED | BP EXPLORATION |
| BP EXPLORATION OPERATING COMPANY LIMITED | BP EXPLORATION |
| BRIDGE PETROLEUM 1 LIMITED | BRIDGE PETROLEUM GROUP |
| BRIDGE PETROLEUM 3 LIMITED | BRIDGE PETROLEUM GROUP |
| BRIDGE PETROLEUM 5 LIMITED | BRIDGE PETROLEUM GROUP |
| BRITOIL LIMITED | BP EXPLORATION |
| BROCKHAM CAPITAL LIMITED | BROCKHAM CAPITAL LIMITED |
| CALDERA PETROLEUM (UK) LTD | ABAN OFFSHORE |
| CALENERGY GAS LIMITED | CALENERGY GAS (HOLDINGS) |
| CALENERGY NORTH SEA LIMITED | CALENERGY GAS (HOLDINGS) |
| CALENERGY RESOURCES (UK) LIMITED | CALENERGY GAS (HOLDINGS) |
| CALENERGY SNS LIMITED | CALENERGY GAS (HOLDINGS) |
| CENTRICA OFFSHORE UK LIMITED | CENTRICA STORAGE HOLDINGS |
| CHEVRON BRITAIN LIMITED | CHEVRON CORPORATION |
| CHRYSAOR (U.K.) SIGMA LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR (U.K.) THETA LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR DEVELOPMENTS LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR NORTH SEA LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR PETROLEUM COMPANY U.K. LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR PETROLEUM LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR PRODUCTION (U.K.) LIMITED | HARBOUR ENERGY PLC |
| CHRYSAOR RESOURCES (IRISH SEA) LIMITED | HARBOUR ENERGY PLC |
| CNOOC PETROLEUM EUROPE LIMITED | CNOOC INTERNATIONAL |
| CNOOC PETROLEUM FARRAGON U.K. LIMITED | CNOOC INTERNATIONAL |
| CNR INTERNATIONAL (U.K.) DEVELOPMENTS LIMITED | CNR INTERNATIONAL |
| CNR INTERNATIONAL (U.K.) LIMITED | CNR INTERNATIONAL |
| COMTRACK (UK) LIMITED | COMTRACK VENTURES |
| CONOCOPHILLIPS (U.K.) HOLDINGS LIMITED | CONOCOPHILLIPS |
| COURAGE ENERGY (U.K.) LIMITED | BRITNRG LIMITED |
| CUADRILLA BALCOMBE LIMITED | CUADRILLA RESOURCES |
| CUADRILLA BOWLAND LIMITED | CUADRILLA RESOURCES |
| CUADRILLA ELSWICK (NO.2) LIMITED | CUADRILLA RESOURCES |
| CUADRILLA ELSWICK LIMITED | CUADRILLA RESOURCES |
| CUADRILLA NORTH CLEVELAND LIMITED | CUADRILLA RESOURCES |
| DANA PETROLEUM (BVUK) LIMITED | DANA PETROLEUM LIMITED |
| DANA PETROLEUM (E&P) LIMITED | DANA PETROLEUM LIMITED |
| DART ENERGY (WEST ENGLAND) LIMITED | STAR ENERGY GROUP PLC |
| DCARBONX LTD | DCARBONX LTD |
| DELTIC ENERGY PLC | DELTIC ENERGY |
| DESS ENERGY LIMITED | DESS EXPLORATION CONSULTING LIMITED |
| DNO EXPLORATION UK LIMITED | DNO NORTH SEA |
| DNO NORTH SEA (ROGB) LIMITED | DNO NORTH SEA |
| DNO NORTH SEA (U.K.) LIMITED | DNO NORTH SEA |
| E. F. OIL AND GAS LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| EGDON RESOURCES (AURORA) LIMITED | HEYCO ENERGY GROUP |
| EGDON RESOURCES U.K. LIMITED | HEYCO ENERGY GROUP |
| ELSWICK POWER LIMITED | A J LUCAS GROUP |
| ENERGEAN UK LTD | ENERGEAN PLC |
| ENI UK LIMITED | ENI UK LIMITED |
| ENQUEST HEATHER LIMITED | ENQUEST PLC |
| ENQUEST PROGRESS LIMITED | ENQUEST PLC |
| ENTERPRISE OIL LIMITED | SHELL PLC |
| EQUINOR UK LIMITED | EQUINOR ASA |
| EQUINOR WOS LIMITED | EQUINOR ASA |
| ESSO EXPLORATION AND PRODUCTION UK LIMITED | EXXONMOBIL INTERNATIONAL |
| EUROPA OIL & GAS LIMITED | EUROPA OIL AND GAS |
| EVERARD ENERGY LIMITED | EVERARD ENERGY |
| EXXONMOBIL SNS LIMITED | EXXONMOBIL INTERNATIONAL |
| FINDER ENERGY UK LIMITED | FINDER ENERGY PTY |
| GAZPROM INTERNATIONAL UK LTD. | GAZPROM INTERNATIONAL |
| HARTSHEAD RESOURCES LTD | HARTSHEAD RESOURCES LTD |
| HARVESTER ENERGY (UK) LIMITED | HARVESTER ENERGY (UK) LIMITED |
| HARWORTH POWER (GENERATION) LIMITED | VELOX POWER |
| HIS GRACE THE DUKE OF DEVONSHIRE | THE CHATSWORTH ESTATES COMPANY |
| HORIZON ENERGY ACQUISITION LIMITED | HORIZON ENERGY PARTNERS |
| HORIZON ENERGY PARTNERS LIMITED | HORIZON ENERGY PARTNERS |
| HORSE HILL DEVELOPMENTS LTD | UK OIL & GAS PLC |
| HUMBLY GROVE ENERGY LIMITED | EP UK INVESTMENTS |
| HUTTON ENERGY UK LIMITED | HUTTON ENERGY LIMITED |
| IGAS ENERGY ENTERPRISE LIMITED | STAR ENERGY GROUP PLC |
| IGAS ENERGY PRODUCTION LIMITED | STAR ENERGY GROUP PLC |
| INEOS CLIPPER SOUTH C LIMITED | INEOS INDUSTRIES |
| INEOS E&P (UK) LIMITED | INEOS INDUSTRIES |
| INEOS FPS LIMITED | INEOS INDUSTRIES |
| INEOS UPSTREAM LIMITED | INEOS INDUSTRIES |
| IRANIAN OIL COMPANY (U.K.) LIMITED | FCM TRUST |
| ISLAND GAS LIMITED | STAR ENERGY GROUP PLC |
| ITHACA (NE) E&P LIMITED | ITHACA ENERGY |
| ITHACA EF LIMITED | ITHACA ENERGY |
| ITHACA ENERGY (UK) LIMITED | ITHACA ENERGY |
| ITHACA EPSILON LIMITED | ITHACA ENERGY |
| ITHACA GAMMA LIMITED | ITHACA ENERGY |
| ITHACA GSA LIMITED | ITHACA ENERGY |
| ITHACA J E&P LIMITED | ITHACA ENERGY |
| ITHACA MA LIMITED | ITHACA ENERGY |
| ITHACA OIL AND GAS LIMITED | ITHACA ENERGY |
| ITHACA SP E&P LIMITED | ITHACA ENERGY |
| ITHACA SP O&G LIMITED | ITHACA ENERGY |
| ITHACA UKCS LIMITED | ITHACA ENERGY |
| ITHACA ZETA LIMITED | ITHACA ENERGY |
| JERSEY PETROLEUM LTD | JERSEY OIL AND GAS PLC |
| JERSEY V&C LTD | JERSEY OIL AND GAS PLC |
| KISTOS ENERGY LIMITED | KISTOS PLC |
| LUCAS BOLNEY LIMITED | A J LUCAS GROUP |
| LUCAS BOWLAND (NO.2) LIMITED | A J LUCAS GROUP |
| LUCAS BOWLAND (UK) LIMITED | A J LUCAS GROUP |
| MCX DUNLIN (UK) LIMITED | MITSUBISHI CORPORATION |
| MCX OSPREY (UK) LIMITED | MITSUBISHI CORPORATION |
| MONTROSE INDUSTRIES LIMITED | MONTROSE INDUSTRIES |
| NEO ENERGY (PRODUCTION) LIMITED | NEO NEXT ENERGY |
| NEO ENERGY (ZEX) LIMITED | NEO NEXT ENERGY |
| NEO ENERGY ALPHA LIMITED | NEO NEXT ENERGY |
| NEO ENERGY BETA LIMITED | NEO NEXT ENERGY |
| NEO ENERGY CENTRAL NORTH SEA LIMITED | NEO NEXT ENERGY |
| NEO ENERGY DELTA LIMITED | NEO NEXT ENERGY |
| NEO ENERGY EXPLORATION UK LIMITED | NEO NEXT ENERGY |
| NEO ENERGY GT LIMITED | NEO NEXT ENERGY |
| NEO ENERGY LNS LIMITED | NEO NEXT ENERGY |
| NEO ENERGY NATURAL RESOURCES LIMITED | NEO NEXT ENERGY |
| NEO ENERGY NORTH SEA LIMITED | NEO NEXT ENERGY |
| NEO ENERGY OIL TRADING LIMITED | NEO NEXT ENERGY |
| NEO ENERGY PETROLEUM LIMITED | NEO NEXT ENERGY |
| NEO ENERGY PRODUCTION UK LIMITED | NEO NEXT ENERGY |
| NEO ENERGY RESOURCES UK LIMITED | NEO NEXT ENERGY |
| NOBEL OIL E&P NORTH SEA LIMITED | NOBEL UPSTREAM |
| NOBLE ENERGY (OILEX) LIMITED | CHEVRON CORPORATION |
| NORTH SEA NATURAL RESOURCES LTD | NORTH SEA NATURAL RESOURCES |
| ONE-DYAS E&P LIMITED | ONE-DYAS |
| ONE-DYAS GEAD & CATCHER LIMITED | ONE-DYAS |
| ONE-DYAS UK LIMITED | ONE-DYAS |
| ONEGAS WEST LIMITED | SHELL PLC |
| ONSHORE PRODUCTION SERVICES LIMITED | ONSHORE OILFIELD SERVICES LIMITED |
| ORCADIAN ENERGY (CNS) LTD | ORCADIAN ENERGY |
| PERENCO GAS (UK) LIMITED | PERENCO OIL & GAS |
| PERENCO NORTH SEA LIMITED | PERENCO OIL & GAS |
| PERENCO UK LIMITED | PERENCO OIL & GAS |
| PETRICHOR ENERGY UK LIMITED | HEYCO ENERGY GROUP |
| PETROGAS NORTH SEA LIMITED | PETROGAS INTERNATIONAL |
| PING PETROLEUM UK PLC | PING PETROLEUM LIMITED |
| PRAX HURRICANE (WHIRLWIND) LIMITED | SERICA ENERGY |
| PRAX HURRICANE GLA LIMITED | SERICA ENERGY |
| PRAX HURRICANE GWA LIMITED | SERICA ENERGY |
| PREMIER OIL E&P UK EU LIMITED | HARBOUR ENERGY PLC |
| PREMIER OIL E&P UK LIMITED | HARBOUR ENERGY PLC |
| PREMIER OIL UK LIMITED | HARBOUR ENERGY PLC |
| RAPID OIL PRODUCTION LTD | RAPID OIL PRODUCTION |
| RATHLIN ENERGY (UK) LIMITED | RATHLIN ENERGY |
| REABOLD RESOURCES PLC | REABOLD RESOURCES |
| REABOLD SOUTHERN NORTH SEA LIMITED | REABOLD RESOURCES |
| REGENT PARK ENERGY LIMITED | INFINIS ENERGY |
| RIGEL PETROLEUM (NI) LIMITED | NEO NEXT ENERGY |
| RIGEL PETROLEUM UK LIMITED | NEO NEXT ENERGY |
| RIGON EXPLORATION LIMITED | RIGON ENERGY |
| RIGON OPERATIONS LIMITED | RIGON ENERGY |
| ROCKROSE (UKCS2) LIMITED | ROCKROSE ENERGY |
| ROCKROSE (UKCS3) LIMITED | ROCKROSE ENERGY |
| ROCKROSE UKCS 10 LIMITED | ROCKROSE ENERGY |
| ROCKROSE UKCS4 LIMITED | ROCKROSE ENERGY |
| SALTFLEETBY ENERGY LIMITED | ANGUS ENERGY |
| SCOTTISHPOWER ENERGY MANAGEMENT LIMITED | SCOTTISH POWER UK PLC |
| SERICA ENERGY (UK) LIMITED | SERICA ENERGY |
| SERICA ENERGY CHINOOK LIMITED | SERICA ENERGY |
| SERICA ENERGY MISTRAL LIMITED | SERICA ENERGY |
| SERICA ENERGY NORTE LIMITED | SERICA ENERGY |
| SEVEN STAR NATURAL GAS LIMITED | INFINIS ENERGY |
| SHELL EP OFFSHORE VENTURES LIMITED | SHELL PLC |
| SHELL U.K. LIMITED | SHELL PLC |
| SOJITZ ENERGY DEVELOPMENT LIMITED | SOJITZ CORPORATION |
| SOLITON RESOURCES LIMITED | SOLITON RESOURCES LIMITED |
| SOUTH WESTERN ENERGY LIMITED | SOUTH WESTERN ENERGY LIMITED |
| SPIRIT ENERGY NORTH SEA LIMITED | SPIRIT ENERGY |
| SPIRIT ENERGY NORTH SEA OIL LIMITED | SPIRIT ENERGY |
| SPIRIT ENERGY PRODUCTION UK LIMITED | SPIRIT ENERGY |
| SPIRIT ENERGY RESOURCES LIMITED | SPIRIT ENERGY |
| SPIRIT ENERGY SOUTHERN NORTH SEA LIMITED | SPIRIT ENERGY |
| SPIRIT NORTH SEA GAS LIMITED | SPIRIT ENERGY |
| STELINMATVIC INDUSTRIES LTD | STELINMATVIC INDUSTRIES |
| TAQA BRATANI LIMITED | TAQA EUROPA B.V. |
| TAQA BRATANI LNS LIMITED | TAQA EUROPA B.V. |
| TERRAIN ENERGY LIMITED | TERRAIN ENERGY |
| TETRA ENERGY UK ONSHORE LTD | TETRA ENERGIES |
| TOTALENERGIES E&P INTERNATIONAL K1 LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TOTALENERGIES E&P INTERNATIONAL K2 LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TOTALENERGIES E&P INTERNATIONAL K3 LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TOTALENERGIES E&P NORTH SEA UK LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TOTALENERGIES E&P UK LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TOTALENERGIES OFFSHORE UK LIMITED | TOTALENERGIES UPSTREAM UK LIMITED |
| TRANSUNION PETROLEUM LIMITED | TRANSUNION PETROLEUM |
| TRANSWORLD PETROLEUM (U.K.) LIMITED | NEO NEXT ENERGY |
| TRIANGLE ENERGY (UK) PTY LTD | TRIANGLE ENERGY GLOBAL |
| TULLOW OIL SK LIMITED | TULLOW UK |
| UK NORTH SEA LIMITED | ADURA ENERGY |
| UKOG (137/246) LTD | UK OIL & GAS PLC |
| UKOG (GB) LIMITED | UK OIL & GAS PLC |
| UNION JACK OIL PLC | UNION JACK OIL PLC |
| UOG PL090 LIMITED | UNITED OIL & GAS PLC |
| WALDORF CNS (I) LIMITED | WALDORF PRODUCTION |
| WALDORF CNS (II) LIMITED | WALDORF PRODUCTION |
| WALDORF OPERATIONS LIMITED | WALDORF PRODUCTION |
| WALDORF PETROLEUM RESOURCES LIMITED | WALDORF PRODUCTION |
| WALDORF PRODUCTION UK PLC | WALDORF PRODUCTION |
| WINTERSHALL NOORDZEE B.V. | WINTERSHALL NOORDZEE |