David John

David John played Derek in the Doctor Who television story Survival. He later voiced several characters for Big Finish Productions including Ace's half-brother Liam McShane.

Doctor Who

 * Survival - Derek

Doctor Who Main Range

 * The Rapture - Liam McShane

Sarah Jane Smith

 * Comeback - Bank Robber

Jago & Litefoot

 * The Flickermen - Pete Stepney