| (1) | 50.1 | Tony Collins | (Hercules AC) | | ??.??1966 |
| | 50.1 | David Marchese | (Surrey AC) | Blackburn | 7.07.1966 |
| (3) | 50.2 | Tony Martin | (Dulwich College) | Hendon | 27.07.1968 |
| (4) | 50.5 | Graham Piggott | (Wallington County Grammar School) | | 22.07.1961 |
| (5) | 50.6 | John Haynes | (Epsom & Ewell Harriers) | | ??.??1956 |
| | 50.6 | Keith Bish | (De Burgh School) | | 30.06.1962 |
| (7) | 50.7 | Simon Lewis | (Epsom Coll) | | 7.07.1967 |
| (8) | 50.9 | Bill Holland | (South London Harriers) | Houghton-le-Spring | 26.07.1958 |
| (9) | 51.3 | John Greatrex | (Alleyns Sch) | Motspur Park | 30.05.1964 |
| | 51.3 | David Weeks | (Mitcham AC) | | 8.06.1964 |
| (11) | 51.4 | Andrew Kennedy | (Whitgift School, Croydon) | | 7.07.1967 |
| (12) | 51.6 | Martin Winbolt Lewis | (Marlborough Col) | | 6.07.1963 |
| | 51.6 | Robert Harrison | (Reed's School, Cobham) | Motspur Park | 15.06.1968 |
| | 51.6 | Mike Fromant | (Mitcham AC) | Motspur Park | 15.06.1968 |
| (15) | 51.8 | D Rhodes | (Mitcham AC) | | 2.06.1962 |
| (16) | 51.9 | Brian Thorniley | (Sutton HS) | | 21.06.1958 |
| (17) | 52.1 | P R Lee | (Hampton GS) | Enfield | 9.06.1956 |
| | 52.1 | Lewis | (Dorking St Paul's AC) | Dorking | 3.08.1963 |
| (19) | 52.5 | A Easthope | (Wim) | Plymouth | 21.07.1956 |
| | 52.5 | R Fisher | (Herne Hill Harriers) | | 2.06.1962 |
| (21) | 52.7 | Graham Pigott | (Wallington Grammar School) | Motspur Park | 26.05.1960 |
| | 52.7 | Adrian Fyfe | (Camberley & District AC) | Bracknell | 11.09.1966 |
| (23) | 52.8 | Rupert Butterfield (U15) | (Guildford & Godalming AC) | | 9.06.1962 |
| (24) | 53.0 | J Price | (Herne Hill Harriers) | | 15.04.1961 |
| (25) | 53.1 | Nick Lovatt | (Whitgift School, Croydon) | | 2.06.1962 |
25 athletes with performances of 53.10 or better. |
