As has been said, you seem to like American comedies.
One show that is called the English "Friends" is Coupling.
About 3 men and 3 women, all 20-something, and their relationships.
I happen to think this is a very funny and well written comedy that bears watching over and over again.
They made 4 series but the first 3 are best. One character, Jeff, is one of the best comedy characters to appear for many years (but he was not in series 4)
More here
http://www.bbc.co.uk/comedy/coupling/