A couple of details from a global opinion survey conducted for the BBC World Service:
The removal of Saddam Hussein was branded a mistake by a majority in 21 of the countries. On average, 45% of those questioned agreed that removing him was a mistake, with 36% supporting the action. In Britain, 40% of those polled said it was a mistake, while 49% backed it.I can't absolutely swear to this, but I do believe I've read rather a lot - including in the newspaper in which the above report appears - telling me different about opinion on such matters in Britain.
Those most in favour of US-led forces staying until Iraq was stable were the US and Afghanistan 58%, Australia 57% and Britain 56%. [My emphases.]