Growing up, I never had cable television. Consequently my viewing options were quite limited, and further consequently I watched a lot of public broadcasting, and furthermost consequently I gained an affection for the many British comedies they would air late on weekend nights.
I've taken to rewatching a few and was delighted to see how well they've held up. I'm currently working my way through Coupling, and even know the exact lines that are coming it's still hilarious.
Shows I've seen much of include:
The Black Adder (all seasons and the special)
Are you being Served?
The Thin Blue Line
And though it's Canadian rather than British, a special mention is deserved by The Red Green Show.
Some series I've heard I should watch include: Fawlty Towers, Yes Minister, and The Royle Family. Any other recommendations?