AGIP
Atlantic Richfield (ARCO)
Abu Dhabi National Oil Company (ADNOC)
ADCO (Abu Dhabi)
ADMA-OPCO (Abu Dhabi)
BP
British Gas
Bunduq (Abu Dhabi)
CALTEX
CSIR (South Africa)
Countyside Council for Wales
European Bank (EBRD)
Enterprise Oil
Exxon/Esso
Holman, Fenwick And Willan (Solicitors)
International Petroleum Corporation (IPC)
Karachaganak Integrated Organisation (Kazakhstan)
Kuwait Oil Tanker Company
Kuwait Petroleum Corporation
LASMO
Maersk
Mobil
MOL (Hungary)
National Drilling Company (Abu Dhabi)
National Oil Corporation (Libya)
Occidental
Oil Spill Response Limited
OGP (E&P Forum)
P&O Company
Qatar Petroleum
Rasgas
Repsol-YPF
RWE Dea
Saipem
Shell
Svenska Petroleum
Talisman
Texaco
Total
Turkish Petroleum Overseas
UK Government Treasury Solicitor
UK Overseas Development Agency
United Nations Environment Programme (UNEP)
United Nations Development Programme (UNDP)
Union Texas Petroleum
Uzbekneftegas
VICO
Waha Oil Company (Libya)
Wintershall
Woodside Petroleum
World Conservation Union (IUCN)
ZADCO (Abu Dhabi)