Index 0-9
The number... 433 was the perfect score on Fifteen-to-One. It was only achieved once in the show's entire history, by Bill McKaig in 1999, although Daphne Fowler and Michael Penrice came close (scoring 432 and 423 respectively).
Shows
| Title | Genre |
| 0 Ond 1 | Quiz, travel, regional (Wales) |
| 007: Road to a Million | Reality, Action and adventure |
| 10 Jonathan | Sports |
| 10 Mile Menu | Lifestyle |
| 100 Grand in 100 Minutes | Radio, lifestyle |
| 100 o Blant | Regional (Wales), family |
| 1000 Heartbeats | Quiz, general knowledge |
| 1000 to 1 | Quiz, general knowledge |
| 1001 Things You Should Know | Quiz, general knowledge |
| 100% | Quiz, general knowledge |
| 101 Ways to Leave a Gameshow | Family game show |
| 15-to-1 | Quiz, general knowledge |
| 1 2 Stri | Academic quiz |
| 1-2-3 Click | Panel game |
| 1 vs 100 | Quiz, general knowledge |
| 12 Stars of Christmas | Variety |
| 180 | Sports |
| 19 Keys | Quiz, general knowledge |
| The 1% Club | Quiz, puzzles |
| 2000 to 1 | Quiz, general knowledge |
| 21 | Quiz, general knowledge |
| The 21st Question | Quiz, general knowledge |
| 24 Hour Panel People | Comedy panel game, webcast |
| 24 Hour Quiz | Quiz, general knowledge |
| 24 Hours to Go Broke | Travel |
| £250 Red Cross Radio Contest | Radio, puzzle |
| 29 Minutes of Fame | Comedy panel game |
| The 3rd Degree | Radio, academic quiz |
| 3 by 3 | Quiz, general knowledge |
| 3-2-1 | Family game show |
| 3G Boss | Business |
| 31 Days in May | Radio, phone-in |
| 5 Gold Rings | Quiz, general knowledge |
| 5NO Brass Band Contest | Radio, regional (North East), variety |
| 50/50 | Childrens |
| 5 Go Dating | Dating |
| 500 Questions | Quiz, general knowledge |
| 5 Minutes to a Fortune | Mental agility |
| 5-Star Family Reunion | Quiz, general knowledge |
| 6 Degrees of Separation | Science panel game |
| The $64,000 Question | Quiz, general knowledge |
| 71 Degrees North | Action and adventure |
| The 78 Show | Radio panel game, music |
| 8 Out of 10 Cats | Comedy panel game |
| 8 Out of 10 Cats Does Countdown | Comedy panel game, puzzle |
| 9 Live Quiz TV | Puzzle |
| The 1970s Office | Reality |
| The 99p Challenge | Radio, comedy panel game |
