The main party leaders have committed to scrutinising their MPs' claims, with various disciplinary actions threatened.
Speaker Michael Martin is going, and Tory MP Douglas Hogg who claimed for his moat will not be seeking re-election, and Hazel Blears faces question about her future.
We listen to what party leaders had to say and Ben Page from Mori talks about how this could affect the polls, ahead of a studio debate.
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