If you have Sky, just keep having a look at the comedy central channel. A lot of the stuff is quite similar on there.
It's Always Sunny in Philadelphia
Happy Endings
Workaholics

The League.
You'll have to try all the recommendations, because it is still all subjective. I love all 3 shows in the OP, and:
It's Always Sunny in Philadelphia - Love
Happy Endings - Love
Workaholics - Hated
Modern Family - Hated
Big Bang Theory - Love
Parks and Recreation - Hated
The League - Love
Archer - Love
Even though it isn't primarily a comedy, Weeds has made laugh many times over the past 7 seasons.
Parks and Recreation get's much better after season one. Stick with it one of the best comedy shows on TV along with Always Sunny.
