This series sees Paul Pennyfeather (Jack Whitehall) as an inoffensive divinity student at Oxford University in the 1920s, who is wrongly dismissed for indecent exposure having been made the victim of a prank by The Bollinger Club.David Suchet will play Dr Fagan, the headmaster of Llanabba, an obscure public school in Wales where Paul first finds employment and works with fellow teacher Grimes (Douglas Hodge). It is at the school that he meets the Honourable Mrs Margot Beste-Chetwynde, to be played by Eva Longoria, who is the mother of one of the pupils.