Actually, your man, Gareth Thomas didn't really do much after B7. I think he thought he was too much of a "serious" actor for this t.v. entertainment for the masses stuff. He seems to have gone to theatre and that's not as much in the public eye.
Re. Peter Capaldi, I've been trying to find some clips from The Thick Of It to illustrate his power as an actor but I really am frightened of what reaction there would be, how much offence I would cause and how hard Mark would skelp me round the head.
So, if you want to see one of the foulest, funniest, political satires ever made and a biting indictment of British politics and spin doctors, look up the title on you tube. BUT BE PREPARED!!!!!
There are times when Capaldi is so menacing.