Doctor Who
Monty Python’s Flying Circus
Are You Being Served?
Father Ted
Fawlty Towers
Jewel in the Crown
Brideshead Revisited
Poirot
Inspector Morse
Yes, Minister/Yes, Prime Minister
Red Dwarf
The Fall and Rise of Reginald
Keeping Up Appearances
Tinker, Tailor, Soldier, Spy
Sherlock Holmes
Miss Marple
Poldark
Rumpole of the Bailey
Reilly, Ace of Spies
I, Claudius
Upstairs, Downstairs
Bleak House
Perrin.
I loved that one and cracked up when his wife invented a lover who was half Scottish and half Hungarian, which is very close to my exact ethnicity.
For one thing, they cut out the part where Caligula eviscerated Drusilla and devoured their fetus. For another, they completely omitted the scene where Cassius Chaerea and his fellow conspirators agreed that only Caligula would be killed in their coup. (A pact Cassius violated.)
I guess bare titties were considered less offensive than outright gore. There are probably more examples, but I didn’t see every episode when I was living in England, so I can’t say.
I wish PBS would show Fall of Eagles again. I wanted to watch it when I was in college, but it didn’t fit into my schedule. On the other hand, I’ve seen every episode of The World at War multiple times.
Reilly, Ace of Spies was another series I never missed an episode of.
I absolutely loved this one…loved the score, too. One I missed when it was first run – I think it was the first big PBS hit – was The Forsyte Saga. Then, our local PBS channel ran the entire series with an episode every Mon-Fri which ran for about a month. This was before vcr’s, so I had to be home every night by 7:00 or 8:00 to watch that episode or I’d miss it. I didn’t miss a single episode.
“The latest thing: GROT!” 
If the US were my house it would be Keeping Up Appearances, The Good Life, and Still Game.
Black Mirror
Allo Allo
Dad’s Army
From Shostakovich’s “The Gadfly Suite.”
Posh Barbara (where Felicity Kendall pours the gravy boat over her front) is our fav episode.
Felicity Kendall, mmmmmmmmmm! 
I was once courting a girl who admitted hating this series. That relationship didn’t last long. 
To the Manor Born
East Enders—honestly I don’t know anyone who watched this but it was on all the time.
Damn, that was a good show. Too good. I have to gird my loins to watch. The last one I watched was the guy who kept facsimiles of people on his own ‘Star Trek’ type simulation and then 2020 happened and I haven’t built up the fortitude to watch another yet.
I believe the writer said he wasn’t writing any more because real life got too dark.
No, Honestly. I had an enormous crush on Pauline Collins, the girl who played Clara.
The theme song is great too:
Jeez, does that bring back memories! 
I love her, too. Have you ever seen Shakespeare Wallah?
If Felicity is in it, I’ll put it on my bucket list!
Wikipedia has a list of British shows based on American ones. Lots of reality shows (Britain’s Got Talent, Ru Paul’s Drag Race, The Apprentice) and game shows, including University Challenge.
Call the Midwife
It kind of blows my mind that Keeping Up Appearances, which from memory was pretty mediocre, found a footing in the US but Only Fools and Horses, which was mostly utterly brilliant, never did.