as Kenneth Horne, in Red Dwarf XI as computer-generated space ship captain Edwin Herring,[3] Hattie[4] as the Carry On film director Gerald Thomas[5] and appeared in the West End version of The 39 Steps.
Beginning in repertory, he performed in A Christmas Carol, When We Are Married and The Relapse (Birmingham Rep) and Sir Toby Belch in Twelfth Night (Theatre Royal, Northampton).
These include: Red Dwarf,[3][18] Little Lord Fauntleroy, The Prince and the Pauper, Cider With Rosie, Peak Practice, Heartbeat as Leonard Parks and Adrian Pym, Monarch of the Glen, Trial & Retribution 1, 2 and 3, The Vice, The Bill, Blue Murder, The Armando Iannucci Show, The Thieving Headmistress, The Antique Rogues Show, Skins and The Cut.
[4] He was also involved in a South Korean cartoon series that was broadcast on CBBC in 2009 called Rocket Boy and Toro.
[21][22] Critchlow was a voice actor for video games like Operation Flashpoint: Resistance, Xenoblade Chronicles 2, Killzone 3, and Final Fantasy XIV: Heavensward.
Notable performances were in radio episodes of Torchwood (Lost Souls) and Doctor Who (The Nowhere Place), Truly, Madly, Bletchley, The Way We Live Right Now, My Turn to Make the Tea, Spats, Journey to the Center of the Earth and Revd.
Critchlow had roles in several video games, including Xenoblade Chronicles 2, Dragon Quest Heroes, Killzone 3, and Final Fantasy 14's Heavensward expansion.