Gabriel Woolf, Doctor Who/The Brothers/Wizards vs Aliens. Like the late Stephen Moore, primarily a voice actor but has appeared on screen.
Vilma Hollingbery, The Sweeney/Not Going Out/Inside no 9/Psychoville
Avril Elgar, George and Mildred/Tales of the Unexpected/Carrie's War
Murray Melvin, Torchwood/Tyrant King/Jonathan Creek
Antony Carrick, Yes Minister/Hammer House of Horror/Tales of the Unexpected (he's the dad in Taste, one of the most famous episodes)
Roland Curram, Terry and June/Eldorado
Sure there's more...