Rumpole of the Bailey interest in nineteenth-century anarchists, especially the Russian Peter Kropotkin from whom the title of the play was drawn. The character's name was later changed to Horace Rumpole when it was discovered that there was a real barrister called Horace Rumbold. The title of the play was briefly changed to "Jolly Old Jean Jacques Rousseau" before settling on the less esoteric "Rumpole of the Bailey". Mortimer was keen on Michael Hordern for the role of Rumpole. When Hordern proved unavailable, the part went to Australian-born actor Leo McKern. Mortimer was initially unenthusiastic about McKern's casting but changed his opinion upon seeing
Leo McKern presented "The Battle of the Somme", a British Broadcasting Corporation documentary produced to mark the 60th anniversary of World War I battle. He played the Earl of Gloucester in the Granada Television production of "King Lear" (1983) with Sir Laurence Olivier. In 1983 also starring in most episodes of the mini-series 'Reilly, Ace of Spies' as 'Zaharov', director of Vickers with Sam Neill. In 1975, McKern made his first appearance in the role that would make him a household name as an actor, Horace Rumpole, whom he played in "Rumpole of the Bailey", originally an episode of the BBC's "Play