| Season Number: | 1 |
| Starring: | Vicki Butler-Henderson (host) Angie Dowds (trainer) Mark Bailey (trainer) |
| Num Episodes: | 11 |
| Network: | LIVINGtv |
The Biggest Loser UK 2005 was the first season of the reality television series entitled The Biggest Loser. The season first aired on 6 October 2005, with the final episode on 15 December 2005, where 12 overweight contestants competed for a cash prize of £25,000. Vicki Butler-Henderson was featured as the host, with trainers Angie Dowds and Mark Bailey. Aaron Howlett was named as the winner after losing .
| Contestant | Age | Hometown | Team | Starting Weight | Status | Weight lost as of Elimination | Weight at Reunion | Weight lost (Reunion) | Percentage of Weight Lost | Body Fat Percentage Loss | Total Score | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tracey Barcoe | 28 | Northwich | Red Team | 20 st 2 lbs | Eliminated Week 1 | 4lb | 18 st | 30lb | 10.6% | 3.2% | 13.8 | |
| Katie Wareing | 30 | Preston | Blue Team | 15 st 3 lbs | Eliminated Week 2 | 15lb | 12 st 5 lbs | 40lb | 18.8% | 9.7% | 28.5 | |
| Paul Tabram | 31 | Swansea | Red Team | 18 st 11 lbs | Eliminated Week 3 | 15lb | 15 st 6 lbs | 47lb | 17.9% | 5.6% | 23.5 | |
| Tamara Joseph | 30 | Birmingham | Red Team | 21 st 3 lbs | Eliminated Week 4 | 15lb | 18 st 8 lbs | 37lb | 12.5% | 7.0% | 19.5 | |
| Dr Shane Lee | 40 | Cardiff | Blue/Red | 22 st 3 lbs | Eliminated Week 5 | 33lb | x | Did not appear | x | x | x | |
| Martin Langmaid | 26 | Exeter | Blue Team | 18 st 9 lbs | Eliminated Week 6 | ?? | See below | |||||
| Nat Curtis | 31 | Reading | Blue Team | 15 st 11 lbs | Eliminated Week 7 | 25lb | See below | |||||
| Barney Gibson | 19 | Tiverton | Red Team | 21 st 1 lb | Withdrew Week 8 | 38lb | 15 st 1 lb | 84lb | 28.5% | 17.9% | 46.4 | |
| Nadine Lautman | 33 | West Yorkshire | Red Team | 16 st 8 lbs | Eliminated Week 8 | 25lb | 12 st 10 lbs | 54lb | 23.3% | 12.5% | 35.8 | |
| Martin Langmaid | Returned Wk 8 | Blue Team | x | Eliminated Week 9 | 44lb | 14 st 1 lb | 64lb | 24.5% | 19.2% | 43.7 | ||
| Samantha Atkins | 33 | London | Blue Team | 23 st 6 lbs | Eliminated Week 10 | ?? | 17 st 3 lbs | 87lb | 26.5% | 10.5% | 37.0 | |
| Nat Curtis | Returned Wk 10 | Blue Team | x | Third Place | x | 11 st 7 lbs | 60lb at Finale | 27.1% | 14.9% | 42.0 | ||
| Mark Whittaker | 38 | Manchester | Red Team | 24 st 4 lbs | Second Place | x | 15 st 9 lbs | 121lb at Finale | 35.6% | 21.6% | 57.2 | |
| Aaron Howlett | 29 | Hull | Blue Team | 24 st 13 lbs | Biggest Loser | x | 15 st 1 lb | 138lb at Finale | 39.5% | 25.4% | 64.9 |
Martin was brought back because Barny had to withdraw due to medical issues.
| Contestant | Prize | |
|---|---|---|
| Aaron Howlett | Main Prize: £25,000. | |
| Mark Whittaker | Second Prize: Holiday in the Caribbean. | |
| Nat Curtis | Third Prize: Holiday in the Caribbean. | |
| Barney Gibson | Eliminated Contestant Prize: Holiday to the Maldives. |
Episode Viewing figures from BARB[1]
| Episode | Date | Total Viewers | LIVINGtv Weekly Ranking | |
|---|---|---|---|---|
| 1 | 6 October 2005 | Under 180,000 | Outside Top 10 | |
| 2 | 13 October 2005 | 210,000 | 6 | |
| 3 | 20 October 2005 | 193,000 | 7 | |
| 4 | 27 October 2005 | 181,000 | 9 | |
| 5 | 3 November 2005 | Under 199,000 | Outside Top 10 | |
| 6 | 10 November 2005 | Under 138,000 | Outside Top 10 | |
| 7 | 17 November 2005 | Under 203,000 | Outside Top 10 | |
| 8 | 24 November 2005 | 180,000 | 10 | |
| 9 | 1 December 2005 | Under 200,000 | Outside Top 10 | |
| 10 | 8 December 2005 | Under 175,000 | Outside Top 10 | |
| 11 | 15 December 2005 | 216,000 | 10 |