Do you have a list for the UK group? I think it'd be a good idea to compare groups like this and see what their links to other players are. I tend to infer these guys are all networked with the antiwar movement in their respective countries and with whoever from French intelligence played a role in the "Wilson affair".
Signatories to the letter, which was delivered to the prime minister on Monday, April 26, include Sir Terence Clark, the UK’s ambassador to Iraq from 1985 to 1989; Sir Marrack Goulding, a former diplomat in Kuwait, Libya, Egypt and Lebanon who worked for the United Nations from 1986 to 1993; and Oliver Miles, ambassador to Libya during the takeover of the Libyan embassy in London during 1984 and now a business consultant on the Middle East.
Some prominent signatories have only recently left the Foreign Office, including Francis Cornish, former head of the Foreign Office news department and UK ambassador to Israel from 1998 to 2001, and Richard Muir, ambassador to Kuwait until 2002. The letter also includes diplomats from outside the Middle East.