These are the proposals from the broadcasters:

• One head-to-head debate between the two leaders who could become Prime Minister – Conservative and Labour. This debate will be co-produced by Sky News and Channel 4 and chaired by Jeremy Paxman. Kay Burley will introduce the programme and present the post-debate analysis. The whole programme will be carried live on Sky and Channel 4 and their digital platforms, as well as having a major presence across social media.

• One debate between the Conservative, Labour and Liberal Democrat leaders. This debate will be produced by the BBC and presented by David Dimbleby. It will be broadcast on BBC One with extensive live coverage on other BBC TV and Radio networks and online.

• One debate between the Conservative, Labour, Liberal Democrat and UKIP leaders. This debate will be produced and broadcast by ITV. The ITV debate, chaired by Julie Etchingham, will air on ITV’s main channel and online

They have written to the four leaders inviting them to take part…

UPDATE: Farage says yes but might want more: “if the political landscape continues to change we would expect and ask for inclusion in a second debate”

UPDATE II: The LibDems say no: “We do not accept proposal that the Lib Dems, as party of government, should be prevented from defending our record in one of the TV debates.”