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| Youths 400 Metres HEAT 1 (Motspur Park, 28 April) | 1 | | John Gladwin | (Belgrave Harriers) | 53.9 | | | Q | | 2 | | D Shaw | (Herne Hill Harriers) | 56.7 | | | | | 3 | | S J Ward | (Hercules Wimbledon AC) | 57.5 | | | | | 4 | | Stephen Child | (Mitcham AC) | 57.7 | | | | | 5 | | A Shaul | (Sutton & Cheam Harriers) | 59.2 | | | | | 6 | | J Hemmings | (Herne Hill Harriers) | 61.3 | | | | |
| | | Youths 400 Metres HEAT 2 (Motspur Park, 28 April) | 1 | | J W Millward | (Camberley & District AC) | 54.6 | | | Q | | 2 | | D Percival | (Epsom & Ewell Harriers) | 55.5 | | | q | | 3 | | Barnaby Brennan | (Sutton & Cheam Harriers) | 57.0 | | | | | 4 | | D Tawiah | (South London Harriers) | 58.3 | | | | | 5 | | S Ahmed | (Kings College School, Wimbledon) | 58.9 | | | | | 6 | | G Sills | (Sutton & Cheam Harriers) | 59.9 | | | | |
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| Youths 400 Metres HEAT 3 (Motspur Park, 28 April) | 1 | | Paul Harmsworth | (Wallington Grammar School) | 55.1 | | | Q | | 2 | | P Silvester | (Surrey Beagles AC) | 55.8 | | | | | 3 | | M Bond | (Herne Hill Harriers) | 56.7 | | | | | 4 | | M Bowyer | (Beverley School, New Malden) | 60.8 | | | | | 5 | | P Timblick | (South London Harriers) | 62.1 | | | | |
| | | Youths 400 Metres HEAT 4 (Motspur Park, 28 April) | 1 | | I N Howe | (Epsom & Ewell Harriers) | 55.4 | | | Q | | 2 | | N Barker | (Dorking St Paul's AC) | 55.6 | | | q | | 3 | | B Cleator | (Sutton & Cheam Harriers) | 56.4 | | | | | 4 | | S Doubell | (Sutton & Cheam Harriers) | 61.3 | | | | | 5 | | S Terry | (Collingwood AC) | 64.7 | | | | |
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| Youths 400 Metres FINAL (Motspur Park, 29 April) | 1 | | John Gladwin | (Belgrave Harriers) | 51.1 | | | | | 2 | | J W Millward | (Camberley & District AC) | 52.9 | | | | | 3 | | D Percival | (Epsom & Ewell Harriers) | 53.2 | | | | | 4 | | Paul Harmsworth | (Wallington Grammar School) | 53.4 | | | | | 5 | | N Barker | (Dorking St Paul's AC) | 54.0 | | | | | 6 | | I N Howe | (Epsom & Ewell Harriers) | 56.4 | | | | |
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