| Senior Men 400 Metres HEAT 1
(Motspur Park, 13 May) | | 1 | | Mark Clark | (Guildford & Godalming AC) | 49.4 | | | Q | | | 2 | | John Gostelow | (Hercules Wimbledon AC) | 50.4 | | | Q | | | 3 | | Ian Grant | (Croydon Harriers) | 50.7 | | | q | | | 4 | | D Cleary | (Mitcham AC) | 51.6 | | | q | | | 5 | | Chris Goscomb | (Surrey Beagles AC) | 53.2 | | | | | | 6 | | P Parish | (Herne Hill Harriers) | 53.7 | | | | |
| | | Senior Men 400 Metres HEAT 2
(Motspur Park, 13 May) | | 1 | | Bob Benn | (Croydon Harriers) | 50.8 | | | Q | | | 2 | | R Roach | (Walton AC) | 52.2 | | | Q | | | 3 | | Nigel Jackman | (Sutton & Cheam Harriers) | 52.7 | | | | | | 4 | | W Potts | (South London Harriers) | 53.2 | | | | | | 5 | | John Watts | (Aldershot, Farnham & District AC) | 54.1 | | | | | | 6 | | Terry Knight | (Collingwood AC) | 56.8 | | | | | | 7 | | R Truter | (Surrey AC) | 59.2 | | | | |
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