However , this became increasingly unlikely and on 11 May , Brown announced his resignation as Prime Minister and as Leader of the Labour Party .
He announced his intention to resign on 10 May 2010 to help broker a Labour - Liberal Democrat deal .
This became increasingly unlikely and on 11 May , Brown announced his resignation as Prime Minister and as Leader of the Labour   .
He announced his intention to resign on 10 May 2010 to help broker a Labour - Liberal Democrat deal .