I can't honestly believe that there hasn't been a thread about this masterwork already, but searching is revealing nothing so I guess not.
In short, I love it. So clever, so true, and so well observed. And, most importantly of all, very very funny.
It also appears that BBC Four have begun showing repeats. They'll be broadcasting series one, in order, every night this week at 19:30. I hadn't noticed, but they started on Saturday, so tonight is episode 3. So that's channel 9 on Freeview, and I think 116 on Sky.