Gordon Brown, but only because I'd vote for Labour over the Tories in protest.
What you have to understand is that in Britain we have a two party system that won't be broken for years, if at all, and out of those two parties they're effectively the same thing nowadays anyway.Both the conservatives and labour are meant to be right and left leaning respectively, but over years of trying to get votes and appease everyone politics here has shifted to an almost permanent state of being centre-right with only minor deviations according to whose in charge at the time. If any other party looks like it might be in a position of power the Government and the Media revert to the seemingly 'Keep Calm and Shut the Fuck Up' attitude of 'We're in charge, other parties are dangerous, we know what's best for you' attitude which basically stops anyone else from having a shot at running the country.
At the moment we have a Conservative government (not a 'coalition', the Lib Dems were the vehicle for the Tories to steam-roller their way into parliament) so we have the current state of affairs where the public sector and the working class are getting shafted by Cameron and his cabinet of elite, upper class wankers who only look after their kind regardless of anyone else.
Also to clarify, despite being anti-conservative I am by no means bigging up New Labour either. By the standards of Old Labour, New Labour is 'Tory-Light'.