Leaders from five of the parties hoping to replace the Conservatives and Lib Dems in government will debate live tonight.
The debate, to be hosted from Central Hall Westminster by David Dimbleby, features the leaders of Labour, UKIP, the SNP, Plaid Cymru and the Greens.
Lots were drawn among the political parties to establish the on-set positions of the leaders. From left to right the leaders will be: Ed Miliband, Leanne Wood, Natalie Bennett, Nicola Sturgeon, and Nigel Farage.
Each will be invited to make a short opening statement before David Dimbleby introduces questions from an audience of 200 voters, selected and weighted to give a cross-section of political opinion.
David Dimbleby is in for a long night and will leave the debating chamber to head off to host Question Time, to be broadcast on BBC One from 10.45pm.
On the panel: Labour's shadow home secretary Yvette Cooper, SNP leader at Westminster Angus Robertson, Liberal Democrat Business Minister Jo Swinson, UKIP's Douglas Carswell, a senior Conservative and the journalist and broadcaster Piers Morgan.
• It will be broadcast live on BBC One, the BBC News Channel, BBC Radio 5 live and online from 8pm until 9.30pm.
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