The series of revelations on the Wikileaks website – which are expected to begin tonight – will put a fresh strain on the “special relationship” between Britain and the United States.
The leaked diplomatic cables, dating from January 2009 to June 2010, cover a huge range of issues and include “lively commentaries” sent to Washington about a host of world leaders whose numbers are understood to include David Cameron and Gordon Brown.
Another series of leaks is thought to deal with Canada’s “inferiority complex”.
Whitehall sources expect them to be “drip fed” out over about a week.
The revelations about what US diplomats reported back on Gordon Brown’s final months in power and the formation of the coalition after May’s election are thought to be among the earliest to be made public in Britain.
A coalition source described the leaks as likely to be “embarrassing rather than damaging” for the current government.
However, he added: “The last Labour government has a lot more reason to be nervous.”
Mr Brown’s rocky relationship with President Barack Obama, which included a notorious visit to New York in September 2009 during which the White House was accused of “snubbing” the former prime minister, is almost certain to be mentioned, as is Britain’s troop withdrawal from Iraq.
The Sunday Telegraph understands that frank assessments of the likelihood – or unlikelihood – of the coalition lasting are set to be included.
Sunday Telegraph http://tinyurl.com/2uwf8yb