BFI - British Film Institute top 100
How many of these have you watched?
https://en.wikipedia.org/wiki/BFI_TV_100
I can claim:
Our Friends in the North - just finished it
Cracker - only a few episodes
Inspector Morse - all
Father Ted - quite a few episodes, but not all
28 Up - all episodes beginning with 7 Up, except 63 Up, which is new
Only Fools and Horses - a few episodes
The Avengers - episodes with Diana Rigg
One Foot in the Grave - quite a few episodes, but not all, watching now
Pride and Prejudice - all
I guess I have quite a few yet to investigate.