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| Boys 400 Metres HEAT 1 (Croydon Arena, 24 April) | 1 | | Kevin Fitzpartick | (Croydon Harriers) | 59.5 | | | | | 2 | | P Bexley | (Hercules Wimbledon AC) | 61.7 | | | | | 3 | | W Newton | (Woking AC) | 62.3 | | | | | 4 | | D Kelly | (Herne Hill Harriers) | 63.0 | | | | | 5 | | R Lindsay | (Hercules Wimbledon AC) | 63.2 | | | | | 6 | | Terry Eaton | (Croydon Harriers) | 66.5 | | | | |
| | | Boys 400 Metres HEAT 2 (Croydon Arena, 24 April) | 1 | | S Frogley | (Haslemere Border AC) | 60.6 | | | | | 2 | | C Bleasdale | (Guildford & Godalming AC) | 62.3 | | | | | 3 | | S Rayner | (Mitcham AC) | 63.4 | | | | | 4 | | D Holmes | (Epsom & Ewell Harriers) | 63.5 | | | | | 5 | | B Huggonson | (Camberley & District AC) | 67.7 | | | | |
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| Boys 400 Metres HEAT 3 (Croydon Arena, 24 April) | 1 | | N Watkins | (Camberley & District AC) | 59.4 | | | | | 2 | | H Scanlon | (Sutton & Cheam Harriers) | 59.7 | | | | | 3 | | D Dapaah | (Hercules Wimbledon AC) | 65.4 | | | | | 4 | | H Sinden | (Camberley & District AC) | 67.4 | | | | | 5 | | M Tranter | (Camberley & District AC) | 70.7 | | | | |
| | | Boys 400 Metres HEAT 4 (Croydon Arena, 24 April) | 1 | | P Hutchinson | (Wandsworth School) | 57.5 | | | | | 2 | | C Watkins | (Hercules Wimbledon AC) | 60.3 | | | | | 3 | | A Owens | (Mitcham AC) | 61.4 | | | | | 4 | | R Froud | (Woking AC) | 65.4 | | | | | 5 | | J Syndercombe | (Camberley & District AC) | 68.0 | | | | |
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| Boys 400 Metres FINAL (Croydon Arena, 24 April) | 1 | | Kevin Fitzpartick | (Croydon Harriers) | 55.0 | | | | | 2 | | S Frogley | (Haslemere Border AC) | 55.8 | | | | | 3 | | P Hutchinson | (Wandsworth School) | 57.4 | | | | | 4 | | N Watkins | (Camberley & District AC) | 58.5 | | | | | 5 | | H Scanlon | (Sutton & Cheam Harriers) | 60.2 | | | | | 6 | | C Watkins | (Hercules Wimbledon AC) | 60.7 | | | | |
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