[Sundae]

I am awful at identifying good acting. Given my non-tv status, I only make an effort when I know the actors involved. And my tastes run to comedy acting. That said, I think people denigrate comedy acting unfairly. It's real (if sometimes grotesque) and it requires precision timing and nuances as well as "selling" a character.

Me being me, I would offer Mark Gatiss playing Owen Fallowfield. A stand out in a series peopled with larger than life characters and prosthetics. Straight to camera and very chilling. He plays a mortician for whom some lines of propriety have become... blurred.
TLoG always skated close to the edge in comedy terms, but this performance was delivered so straight. It was Alan Bennett with a twist of formaldehyde.

Along the same lines I have to give Matthew Kelly props for his equally chilling Brian Wicklow (a serial killer) in In Cold Blood. Such a remove from his usual TV hosting persona.

Can't find clips for either, sorry.