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| 400 |
| Pos | Perf | Name | | AG | | Age | DOB | Coach | Club | SB | PB | |
| 1 | 59.72 | Che Pomphrey | SB | U15 | M | | | | Cardiff & The Vale Schs | 59.40 | 59.40 |  |
| 2 | 60.08 | Trenton Scantlebury | | U15 | M | | | | Cardiff & The Vale Schs | 59.03 | 58.94 | |
| 3 | 60.29 | Jacob John | | U15 | M | | | | Cardiff & The Vale Schs | 58.77 | 58.3 | |
| 4 | 60.79 | Toby Thomas | | U15 | M | | | | Cardiff & The Vale Schs | 59.71 | 59.71 | |
| 5 | 60.83 | Toby O'Leary | | U15 | M | | | | Cardiff & The Vale Schs | 58.97 | 58.97 | |
| 6 | 60.97 | Paul Naylor | | U15 | M | | | | Cardiff & The Vale Schs | 59.03 | 59.03 | |
| 7 | 61.18 | Max Parr | | U15 | M | | | | Cardiff & The Vale Schs | 59.35 | 54.6 | |
| 400 h1 |
| Pos | Perf | Name | | AG | | Age | DOB | Coach | Club | SB | PB | |
| 1 | 59.03 | Trenton Scantlebury | SB | U15 | M | | | | Cardiff & The Vale Schs | 59.03 | 58.94 | |
| 2 | 59.35 | Max Parr | SB | U15 | M | | | | Cardiff & The Vale Schs | 59.35 | 54.6 | |
| 3 | 59.86 | Luke Harry | | U15 | M | 14 | 07.05.97 | | Cardiff | 57.8 | 56.45 | |
| 4 | 60.30 | James Neill | PB | U15 | M | | | | Cardiff & The Vale Schs | 60.30 | 60.30 | |
| 5 | 61.20 | Gavin Joseph | PB | U15 | M | | | | Cardiff & The Vale Schs | 61.20 | 61.20 | |
| 7 | 62.30 | Aron Cynnan | SB | U15 | M | | | | Cardiff & The Vale Schs | 62.30 | 60.14 | |
| 400 h2 |
| Pos | Perf | Name | | AG | | Age | DOB | Coach | Club | SB | PB | |
| 1 | 59.71 | Toby Thomas | PB | U15 | M | | | | Cardiff & The Vale Schs | 59.71 | 59.71 | |
| 2 | 60.70 | Josh Martin | PB | U15 | M | | | | Cardiff & The Vale Schs | 60.70 | 60.70 | |
| 3 | 62.40 | Harry Thomas | | U15 | M | | | | C&V Sch | | | |
| 4 | 62.70 | Aaron Canter | PB | U15 | M | | | | Cardiff & The Vale Schs | 62.70 | 62.70 | |
| 5 | 64.30 | Arran Jones | | U15 | M | | | | C&V Sch | | | |
| 400 h3 |
| Pos | Perf | Name | | AG | | Age | DOB | Coach | Club | SB | PB | |
| 1 | 58.77 | Jacob John | SB | U15 | M | | | | Cardiff & The Vale Schs | 58.77 | 58.3 | |
| 2 | 58.97 | Toby O'Leary | PB | U15 | M | | | | Cardiff & The Vale Schs | 58.97 | 58.97 | |
| 3 | 59.03 | Paul Naylor | PB | U15 | M | | | | Cardiff & The Vale Schs | 59.03 | 59.03 | |
| 4 | 59.40 | Che Pomphrey | PB | U15 | M | | | | Cardiff & The Vale Schs | 59.40 | 59.40 | |
| 5 | 61.00 | Matthew Broderick | PB | U15 | M | | | | Cardiff & The Vale Schs | 61.00 | 61.00 | |
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