McMenamin has appeared on various BBC and ITV programmes, including 4:50 From Paddington, an episode of Agatha Christie's Marple (starring Geraldine McEwan), in which he played Cedric Crackenthorpe, and in the Channel 4 comedy series The Young Person's Guide To Becoming A Rock Star. In 1999 he was cast in the title role of the BBC1 television movie David Copperfield. He co-starred in The Golden Hour (ITV, 2005), playing a Doctor.