What’s your favourite single episode of a British TV series?

I've got a load in my head but I'll go with Shut up and Dance from Black Mirror. It wasn't as 'out there' as other episodes in the series, but that's what made it more compelling as you can imagine it happening.

Other ones include 'Breach' in Line of Duty where Dot escapes the police station, 'Party' from Mighty Boosh and 'Basic Alan' from I'm Alan Partridge