Source: ITN - Prime Minister Gordon Brown is under further pressure to step down as another minister has quit the Cabinet. Work and Pensions Secretary James Purnell has dramatically announced he is quitting parliament as polls closed in crunch elections. In a resignation letter released to several newspapers, Mr Purnell called on Mr Brown to step aside for the good of the Labour Party, saying that his continued leadership makes a Conservative victory more, not less, likely. The letter reads: "Dear Gordon, We both love the Labour Party. I have worked for it for twenty years and you for far longer. We know we owe it everything and it owes us nothing. "I owe it to our Party to say what I believe no matter how hard that may be. I now believe your continued leadership makes a Conservative victory more, not less likely.