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:
They also did a pilot of Red Dwarf!
Monsters!
They tried that one twice!
You forgot Little Jimmy. shoe-in for such a role...