Nigel, I can't see why Blair would be disqualified. They ask for "contemporary" politicians, which is not the same as "current" or "active". I hope I'm right, otherwise my entries are destined for the S-bend of competition history.
Certainly Blair should not be disqualified. In today's Daily Mail he says he'd like to be Prime Minister again and it was only bloody Brown who cused him to go and sentence us to the mad Scotsman's rule.