| Youths 400 Metres HEAT 1 (Motspur Park, 13 May) | 1 | | T Spender | (Croydon Harriers) | 54.0 | | | Q | | 2 | | N Fredman | (Sutton & Cheam Harriers) | 54.3 | | | Q | | 3 | | Wayne Abrehart | (Mitcham AC) | 54.3 | | | q | | 4 | | R Eddington | (St Josephs's College, Upper Norwood) | 56.3 | | | | | 5 | | M Grover | (Camberley & District AC) | 58.1 | | | | | 6 | | G Boot | (Kings College School, Wimbledon) | 58.3 | | | | | 7 | | D Batchelor | (Glebelands Sch) | 60.5 | | | | |
| | | Youths 400 Metres HEAT 2 (Motspur Park, 13 May) | 1 | | David Mote | (Surrey AC) | 50.7 | | CBP | Q | | 2 | | J Kearns | (St Josephs's College, Upper Norwood) | 54.1 | | | Q | | 3 | | D Compton | (Hercules Wimbledon AC) | 56.0 | | | q | | 4 | | G Goode | (Kings College School, Wimbledon) | 56.7 | | | | | 5 | | S Fletcher | (Belgrave Harriers) | 58.0 | | | | | 6 | | D Fullerton | (South London Harriers) | 58.8 | | | | | 7 | | M Carter | (St Josephs's College, Upper Norwood) | 59.3 | | | | |
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