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
John Mortimer in 1975. Although not Mortimer's first choice of actor (in an interview on the DVD set, he said he wanted Alistair Sim -- "but he was dead"), Leo McKern played the character with gusto and proved popular; accordingly, the idea was developed into a series, "Rumpole of the Bailey", for Thames Television in which McKern again took the lead role. Mortimer also wrote a series of Rumpole books. In September–October 2003, BBC Radio 4 broadcast four new 45-minute Rumpole plays by Mortimer with Timothy West in the title role. Mortimer also dramatised many of the real-life cases of the barrister