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| Boys 400 Metres HEAT 1
(Croydon Arena, 29 April) | | 1 | | R Green | (Ranelagh Harriers) | 58.5 | | | | | | 2 | | B Zreik | (Belgrave Harriers) | 59.5 | | | | | | 3 | | M Nathan | (Guildford & Godalming AC) | 61.1 | | | | | | 4 | | P Grimes | (Woking AC) | 62.7 | | | | | | 5 | | W Davis | (King Edward School, Witley) | 64.2 | | | | | | 6 | | R Shepherd | (Mitcham AC) | 66.3 | | | | |
| | | Boys 400 Metres HEAT 2
(Croydon Arena, 29 April) | | 1 | | Paul Roberts | (Mitcham AC) | 56.0 | | | | | | 2 | | J Downing | (Guildford & Godalming AC) | 57.4 | | | | | | 3 | | S Brett | (Epsom & Ewell Harriers) | 58.8 | | | | | | 4 | | S Rayner | (Mitcham AC) | 59.5 | | | | | | 5 | | C Street | (Mitcham AC) | 65.5 | | | | | | 6 | | N Vaughan | (Epsom & Ewell Harriers) | 72.6 | | | | |
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| Boys 400 Metres HEAT 3
(Croydon Arena, 29 April) | | 1 | | A Jeff | (Redhill & Reigate AC) | 57.4 | | | | | | 2 | | Robert Jackson | (Waverley Harriers) | 58.7 | | | | | | 3 | | E Downing | (Guildford & Godalming AC) | 61.3 | | | | | | 4 | | David Chapman | (South London Harriers) | 78.6 | | | | |
| | | Boys 400 Metres HEAT 4
(Croydon Arena, 29 April) | | 1 | | D Kelly | (Herne Hill Harriers) | 58.4 | | | | | | 2 | | A Thomas | (Wandsworth School) | 61.3 | | | | | | 3 | | J Watkins | (Kings College School, Wimbledon) | 62.6 | | | | | | 4 | | M Tranter | (Camberley & District AC) | 64.5 | | | | | | 5 | | Lee Gardner | (Croydon Harriers) | 69.3 | | | | |
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| Boys 400 Metres FINAL
(Croydon Arena, 29 April) | | 1 | | Paul Roberts | (Mitcham AC) | 55.3 | | | | | | 2 | | J Downing | (Guildford & Godalming AC) | 56.5 | | | | | | 3 | | Robert Jackson | (Waverley Harriers) | 56.6 | | | | | | 4 | | A Jeff | (Redhill & Reigate AC) | 57.2 | | | | | | 5 | | R Green | (Ranelagh Harriers) | 59.1 | | | | | | 6 | | S Brett | (Epsom & Ewell Harriers) | 59.2 | | | | | | 7 | | D Kelly | (Herne Hill Harriers) | 60.2 | | | | |
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