Broadcasters should dictate terms of TV debates, Labour's Alexander says

Labour election strategist Douglas Alexander says broadcasters, not the prime minister, should dictate the terms of TV general election debates.

The Labour, Lib Dem and UKIP leaders are asking broadcasters to press ahead with programmes, even if David Cameron refuses to take part.

Ed Miliband, Nick Clegg and Nigel Farage have written to Mr Cameron saying it would be "unacceptable" for him to refuse to appear.

Mr Cameron has said he will take part only if the Green Party is included.