Prime Minister David Cameron
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David Cameron: Alternative vote is a 'crazy, undemocratic system'

Prime Minister David Cameron has branded the alternative vote (AV) system "undemocratic, obscure, unfair and crazy", ahead of May's referendum on changing the way MPs are elected to Westminster.

Speaking in Swansea, Mr Cameron said the vote was "hugely important" to Britain and went on to quote Sir Winston Churchill, who stood against the introduction of AV in 1931.

Mr Cameron is at odds with coalition partners the Liberal Democrats, who strongly support the Yes campaign. In Opposition, Ed Miliband's Labour party has launched both Yes and No campaigns.

Go to next video: Voting referendum: What is AV?