The comedy will open at Islington, North London’s King’s Head Theatre on July 31 following previews from July 20.

Written by Spectator journalists and drama critics Toby Young and Lloyd Evans, A Right Royal Farce is set after the Queen’s death and imagines a Machiavellian Prince Harry – the Queen’s youngest grandson - making a bid for the throne.

Directed by Alan Cohen, the cast includes Sarah Crowe as Camilla Parker Bowles and Andrew C. Wadsworth as her husband, better known as Prince Charles.

Who’s The Daddy was inspired by the sexual shenanigans at the magazine’s offices. The most high-profile of the three affairs reached as far up the political ladder as Home Secretary David Blunkett, whose affair with publisher Kimberly Quinn, wife of Vogue publisher Stephen Quinn, eventually led to Blunkett's resignation.

Young is the author of “How To Lose Friends and Alienate People,” an autobiographical account of his stint working for Vanity Fair in New York. Young later adapted the book for the stage, casting himself as himself in the West End version of the one-man show. "It may sound controversial, but in terms of subject-matter A Right Royal Farce couldn’t be more conventional," said Evans. "The Royals have been a staple of British satire from Swift to Spitting Image."

For more on A Right Royal Farce, call (0)7226 1916.