I thought there was a DR2016 thread, but can't find it. Anyway Burt Kwouk, aka Cato.
Yeah, there is a thread somewhere...
Burt was in the later series of Last of the Summer Wine. He was probably the best thing about it after most of the main character actors had karked it.
Don't think I ever saw him in anything except PP. Maybe I did and didn't recognize him.