10 sounds like Hancock's Half Hour
Opening Lines from Sitcoms - Quiz Page 2
11. Fry and Laurie
Was that radio or TV HHH?
20 The Frost Report?
20. MPFC
Quote: Griff @ May 30 2008, 9:01 PM BSTTV - it's the opening line of "The Missing Page", where he goes to the library.
Oh arse! I only watched that this week! >_<
Quote: Aaron @ May 30 2008, 9:02 PM BST20. MPFC
Oh arse! I only watched that this week! >_<
Classic line dear boy 
16. Fawlty Towers again?
Quote: Griff @ May 30 2008, 9:04 PM BST8 points left to play for. Alan C can still get joint victory.
Off to get some food now. Back later...
Yeah right I missed all the easy ones
14. Porridge.
Nothing ventured, etc.
Quote: Griff @ May 30 2008, 8:56 PM BST3. It is the morning of my fifty-second birthday.
4. Horatio.
7. My school, my school, how bravely she stands, Long steeped in the memories of Time's aging hands.
8. Morning, Cliff, let me take that.
11. Yes, Timothy. A word. I want to... damn this drawer, I just cannot open it, would you mind, I wonder Timothy ?
14. Right, he's all yours then.
16. Now calm down, dear.
21. It's the early hours of Friday 23rd now. I am most excited.
23. Oh yeah, I left your teabag in.
7. Ripping Yarns
Maybe?
14 Prisoner and Escort - Seven of One
Sorry Nigel just piggybacking your answer there 
21 Ripping Yarns
8 The Young Ones
4 The Brittas Empire
I kept thinking it was The Young Ones. But Griff said that was a hard one (oo er).
Lots of guesses in my answers
4 Ladies and Gentlemen
23 Men Behaving Badly
Food is for wimps - come back griff before I steal all of Aarons points! 
The fact that some of the answers come from American sitcoms concerns me
Number 3 feels extremely familiar, but I can't place it. *strokes chin*