I’ll go first…The Office.
Now I know the two shows are fundamentally quite different, but they adapted what was already a very successful show, and turned It into an event more successfully one that lasted for significantly longer than the original did. I say that’s a win for them.
Anything else? Life on Mars, Being Human, The Inbetweeners…?
There’s quite a good Wikipedia article on this.
Amongst all the quiz and reality shows, there are a few intriguing obscure nuggets:
Cosby predates One Foot in the Grave - I remember watching Cosby as a kid in the 80s, and OFitG didn’t show up until the 90s. OFitG became (I think) Curb Your Enthusiam.
The Cosby Show was the 80s. Cosby was 96-2000.