West End star Bertie Carvel will play Nick Clegg with Mark Dexter in the role of David Cameron and Ian Grieve as Gordon Brown.
Carvel won several awards for his performance as Miss Trunchbull in the stage adaptation of Matilda.
The Channel 4 drama is written by playwright James Graham whose political play This House, set at the end of James Callaghan's Labour government, was a hit at the National Theatre.
The broadcaster said the show “charts the emotionally wrought, politically-charged and often frenzied moments which led to Nick Clegg's astonishing rise from rank outsider to the man who would decide the fate of the country”.
Filming on the 90 minute show starts in London next week. It follows in the footsteps of other award-winning political dramas on the channel including Mo - a biopic of Mo Mowlam starring Julie Walters - and The Deal which starred Michael Sheen and David Morrissey as Tony Blair and Gordon Brown.
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