Explanation for overseas readers: David 'Dave' Cameron is leader of the Conservative Party. He is an old Etonian and considers his (very wealthy) wife unconventional because she went to day school. He's sort of like a Tory Blair and that is not a compliment. He is likely to be Prime Minister by summer. It has been made public that his photo in various billboard posters has been airbrushed.
Oh dear! Never underestimate the British capacity for mockery. The original poster said 'We can't go on like this. I'll cut the deficit not the NHS'. Once the cat was out of the bag as regards the airbrushing of our hero's apparently not smooth enough features all sorts of naughty people (including the wonderful Beau Bo D'Or - link to left) got going producing parodies. here are some of the best gathered at My David Cameron