Watch live from 11.30am as the Marriage (Same Sex Couples) Bill gets its second reading, before MPs debate the issue ahead of tonight's vote.
All three main party leaders are allowing their members a free vote on what is seen as a conscience issue.
David Cameron faces being deserted by more than half of his MPs, but several high-ranking Conservatives have joined forces to declare that allowing gay marriage
All three main party leaders are allowing their members a free vote on what is seen as a conscience issue.
David Cameron faces being deserted by more than half of his MPs, but several high-ranking Conservatives have joined forces to declare that allowing gay marriage