First of all, far too few episodes!
This show mastered the "let's see how long an uncomfortable moment be funny" department. I can't really tell you my very fave moment from the whole thing...there were so many. Like when David does his...uh "dance" in an effort to upstage Neil's SATURDAY NIGHT FEVER tribute. See, I can't even get started.
Of all of my American friends who are fans of the US version, only a very few have seen the UK version. It's a shame.
BUT, at the end of the day, this is a classic and is def in my top 5 fave comedy shows!