20. The Persuaders
19. Countdown
18. The Shadow Line
17. Gladiators
16. Bird Of Prey
15. Jaunty Cockney Singalong, Part I: Minder
...and not forgetting the longer version of the song over the closing credits.
14. Spooks
13. Jazzy, art deco-styled ITV show titles from around 1990, Part I: Jeeves & Wooster
12. Jaunty Cockney Singalong, Part II: Only Fools & Horses
Only Fools didn't just have one jaunty original song, of course. The closing credits song was just as memorable.
11. "You're only here for your theme tune", Part I: Ski Sunday
10. "You're only here for your theme tune", Part II: The BBC's Formula 1 coverage
9. Blackadders II, III and Forth
8. The Prisoner
7. Life On Mars
6. The Day Today & Brass Eye
5. "You're only here for your theme tune", Part III: The BBC News countdown
4. Arena
3. The South Bank Show
2. Jazzy, art deco-styled ITV show titles from around 1990, Part II: Poirot
1. Doctor Who
Now, please tell us all the great ones we missed. (Note: we didn't include any children's TV shows, because they're probably a different list.)