Series Twelve first aired on 6th October 2002 and ended on 18th May 2003. It consists of 25 episodes.
Episodes[]
| Episode Number | Running Total | Episode Name | Airdate (UK) |
| 1 | 199 | Skeletons and Cupboards | 6th October 2002 |
| 2 | 200 | A Girl's Best Friend | 13th October 2002 |
| 3 | 201 | A Dog's Life | 20th October 2002 |
| 4 | 202 | Where There's Muck | 3rd November 2002 |
| 5 | 203 | Harmony | 10th November 2002 |
| 6 | 204 | No Man's Land | 17th November 2002 |
| 7 | 205 | Dirty Len | 24th November 2002 |
| 8 | 206 | Growing Apart | 1st December 2002 |
| 9 | 207 | Many Splendoured Thing | 8th December 2002 |
| 10 | 208 | Horses for Courses | 15th December 2002 |
| 11 | 209 | Sins of the Fathers | 22nd December 2002 |
| 12 | 210 | Bread and Circuses | 29th December 2002 |
| 13 | 211 | For Whom the Bell Tolls | 5th January 2003 |
| 14 | 212 | Out of the Blue | 12th January 2003 |
| 15 | 213 | The High Life | 9th March 2003 |
| 16 | 214 | Hung for a Sheep | 16th March 2003 |
| 17 | 215 | The Third Man | 23rd March 2003 |
| 18 | 216 | Missing in Action | 30th March 2003 |
| 19 | 217 | Caped Crusaders | 6th April 2003 |
| 20 | 218 | Moving Target | 13th April 2003 |
| 21 | 219 | Lily of the Valley | 20th April 2003 |
| 22 | 220 | House Rules | 27th April 2003 |
| 23 | 221 | Mackerel Sky | 4th May 2003 |
| 24 | 222 | Absent Friends | 11th May 2003 |
| 25 | 223 | Music of the Spheres | 18th May 2003 |
