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| Boys 400 Metres HEAT 1 (Motspur Park, 25 April) | 1 | | A Moore | (Surrey AC) | 56.8 | | | | | 2 | | M Vaughan | (Epsom & Ewell Harriers) | 59.4 | | | | | 3 | | P Heron | (Kings College School, Wimbledon) | 62.0 | | | | | 4 | | John Booth | (Hercules Wimbledon AC) | 62.8 | | | | | 5 | | R Collinson | (Epsom & Ewell Harriers) | 63.4 | | | | | 6 | | J Dobbs | (Mitcham AC) | 68.3 | | | | | 7 | | D Masters | (Mitcham AC) | 69.3 | | | | |
| | | Boys 400 Metres HEAT 2 (Motspur Park, 25 April) | 1 | | P Rose | (Dorking St Paul's AC) | 58.7 | | | | | 2 | | C Andrews | (Mitcham AC) | 61.3 | | | | | 3 | | D Britten | (Kings College School, Wimbledon) | 62.0 | | | | | 4 | | M Thomas | (Mitcham AC) | 62.6 | | | | | 5 | | R Pamphlett | (Collingwood AC) | 65.7 | | | | | 6 | | R Sullivan | (Mitcham AC) | 71.2 | | | | | 7 | | A Newbury | (Mitcham AC) | 72.6 | | | | |
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| Boys 400 Metres HEAT 3 (Motspur Park, 25 April) | 1 | | Michael Carlile | (Croydon Harriers) | 59.0 | | | | | 2 | | M Price | (South London Harriers) | 59.5 | | | | | 3 | | M Waller | (Surrey AC) | 60.4 | | | | | 4 | | L Tunesi | (Herne Hill Harriers) | 61.7 | | | | | 5 | | S Taylor | (Dorking St Paul's AC) | 65.9 | | | | | 6 | | C Newman | (Camberley & District AC) | 68.7 | | | | | 7 | | I Chick | (Camberley & District AC) | 72.2 | | | | |
| | | Boys 400 Metres HEAT 4 (Motspur Park, 25 April) | 1 | | S Powell | (Woking AC) | 60.5 | | | | | 2 | | A Brennan | (Mitcham AC) | 63.6 | | | | | 3 | | A Andrews | (Woking AC) | 64.5 | | | | | 4 | | G Adams | (Mitcham AC) | 66.1 | | | | | 5 | | J Maskrey | (Waverley Harriers) | 68.2 | | | | | 6 | | E Jennings | (Camberley & District AC) | 72.2 | | | | |
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