Do Nothing till You Hear From Me (2004) was a six-part BBC Radio 4 sitcom written by British comic actor and writer Marcus Powell based on his Roy Diamond character. In the radio version, produced by Carole Smith, the cantankerous Jamaican stand-up comedian played by Powell was transformed into an equally cantankerous trombone player, Roy Walcott, played by Ram John Holder (of Desmond's and Porkpie fame). The stellar supporting cast included Sam Kelly (Porridge) George Layton, Yvonne Brewster, Caroline Lee Johnson (Chef!) and Marcus himself playing Roy's long-suffering son-in-law Victor.
Guest stars included Gerald Harper (Adam Adamant, Hadleigh) Melvyn Hayes (It Ain't Half Hot Mum) and Gemma Craven (Clare in the Community). The show was recorded at London's Drill Hall complete with live trombonist, and was co-written with The Stage′s Agony Uncle, John Byrne.