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| IAAF World Junior Championships, 8-12 August, 1990, Plovdiv, Bulgaria | Representing |
| 8-12 August | Under-20 Men | 100 Metres | FINAL | 2 | Jason Livingston | (Croydon Harriers) | 10.25/(+0.7) | | | Great Britain & Northern Ireland |
| 8-12 August | Under-20 Men | 4 X 100 Metres Relay | FINAL | 4 | Jason Livingston (Leg 1) | (Croydon Harriers) | 39.78 | | | Great Britain & Northern Ireland |
| 8-12 August | Under-20 Women | 200 Metres | S-FINAL 2 | 7 | Donna Fraser | (Croydon Harriers) | 24.19 | | | Great Britain & Northern Ireland |
| 8-12 August | Under-20 Women | 4 X 100 Metres Relay | FINAL | 2 | Annabel Soper (Leg 1) | (Croydon Harriers) | 44.16 | | | Great Britain & Northern Ireland |
| 8-12 August | Under-20 Women | 4 X 100 Metres Relay | FINAL | 2 | Donna Fraser (Leg 3) | (Croydon Harriers) | 44.16 | | | Great Britain & Northern Ireland |
| 8-12 August | Under-20 Women | High Jump | FINAL | 3 | Lea Haggett | (Croydon Harriers) | 1.88m | | | Great Britain & Northern Ireland |
