| Event | Meeting | Venue | Date | Iwan Thomas | Tim Benjamin | Jamie Baulch | Dai Greene | Matt Elias | Owen Smith | Joseph Brier | Gareth Warburton | John Robertson | Rhys Williams |
| 400 | Bupa | Gateshead | 30 Jun 96 | 44.94 | 1 | | | 45.06 | 3 | | | | | | | | | | | | | | |
| 400 | Securicor | Crystal Palace | 12 Jul 96 | 45.08 | 3 | | | 45.50 | 6 | | | | | | | | | | | | | | |
| 400 | McDonalds | Don Valley | 25 Aug 96 | 45.77 | 5 | | | 45.50 | 4 | | | | | | | | | | | | | | |
| 400 | Securicor | Don Valley | 29 Jun 97 | 44.49 | 1 | | | 45.51 | 5 | | | | | | | | | | | | | | |
| 400 | Spar | Crystal Palace | 17 Aug 97 | 44.69 | 1 | | | 45.78 | 6 | | | | | | | | | | | | | | |
| 400 | Commonwealth Games | Kuala Lumpur, MAS | 17 Sep 98 | 44.61 | 1s2 | | | 44.83 | 2s2 | | | | | | | | | | | | | | |
| 400 | Commonwealth Games | Kuala Lumpur, MAS | 18 Sep 98 | 44.52 | 1 | | | 45.30 | 4 | | | | | | | | | | | | | | |
| 400 | Welsh Championships | Cardiff | 29 Aug 05 | 47.40 | 3 | | | | | 48.15
49.02 | ht
5 | | | | | | | | | | | | |
| 400 | DM Hall Scottish Indoor Championships | Glasgow | 22 Jan 06 | | | | | | | 47.64
48.11 | 1
sf | | | | | | | 48.01
48.35 | 2
sf | | | | |
| 400 | Bendigo, AUS | Bendigo, AUS | 12 Mar 06 | | | | | | | 47.13 | 2 | | | | | | | 47.94 | 3 | | | | |
| 400 | Norwich Union European Trials inc AAA Championships | Sportcity | 15 Jul 06 | | | 45.92 | 1s1 | | | | | | | | | | | 46.91 | 4s1 | | | | |
| 400 | Norwich Union European Trials inc AAA Championships | Sportcity | 16 Jul 06 | | | 46.00 | 1 | | | | | | | | | | | 47.32 | 7 | | | | |
| 400 | Cheltenham Mid-Summer Open | Cheltenham | 19 Jul 06 | | | | | | | 47.3 | 1r1 | | | | | | | 47.5 | 2r1 | | | | |
| 400 | Welsh Open Senior Championships | Cardiff | 13 Jan 07 | | | | | | | 48.4 | 1rA | 48.9 | 2rA | | | | | | | | | | |
| 400 | Norwich Union Indoor Grand Prix | Birmingham | 17 Feb 07 | | | | | | | 47.56 | 6r2 | | | | | | | 47.55 | 5r2 | | | | |
| 400 | Welsh Athletics Senior Championships & Commonwealth Games Trials | Cardiff | 1 Jun 14 | | | | | | | | | DNS | - | 47.73 | 1 | | | | | | | | |
| 400 | British Athletics League Division 1 | Basingstoke | 6 May 17 | | | | | | | | | | | 47.36 | 1rA | 48.22 | 2rA | | | | | | |
| 400 | Welsh Senior Championships | Cardiff | 10 Jun 17 | | | | | | | | | | | 47.41 | 1 | 48.25 | 2 | | | | | | |
| 400 | British Championships (Inc European Trials) | Birmingham | 30 Jun 18 | | | | | | | | | | | 47.03 | 2h4 | 47.62 | 3h4 | | | | | | |
| 400 | Scottish National Open | Emirates Arena | 12 Jan 19 | | | | | | | | | | | 47.62 | 1r1 | 48.27 | 2r1 | | | | | | |
| 400 | British Championships | Birmingham | 9 Feb 19 | | | | | | | | | | | 46.85 | 1s1 | 47.54 | 2s1 | | | | | | |
| 400 | British Championships | Birmingham | 10 Feb 19 | | | | | | | | | | | 46.37 | 2 | 47.42 | 4 | | | | | | |
| 400 | Belfast International | Belfast | 1 Aug 19 | | | | | | | | | | | 47.27 | 2rA | 47.12 | 1rA | | | | | | |