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| Under-15 Boys 100 Metres HEAT 1 (Kingsmeadow Stadium, 25 May) | 1 | | Ade Adeniran | (Herne Hill Harriers) | 12.14 | -1.0 | | Q | | 2 | | Emmanuel Adeoye | (South London Harriers) | 12.18 | -1.0 | | Q | | 3 | | Harry Holmes-Davies | (St Mary's Richmond AC) | 12.39 | -1.0 | | Q | | 4 | | Tom McGachie | (Dorking Mole Valley AC) | 12.44 | -1.0 | | Q | | 5 | | Eric Sarfo | (Sutton & District AC) | 12.47 | -1.0 | | q | | 6 | | Miles Molan | (Aldershot, Farnham & District AC) | 13.29 | -1.0 | | | | 7 | | Kyle Sterling | (Herne Hill Harriers) | 13.72 | -1.0 | | | | 8 | | Leon Blatch | (Croydon Harriers) | 14.71 | -1.0 | | | |
| | | Under-15 Boys 100 Metres HEAT 2 (Kingsmeadow Stadium, 25 May) | 1 | | Cathan Marcell | (Herne Hill Harriers) | 12.16 | -3.3 | | Q | | 2 | | Chuks Ajeh | (Croydon Harriers) | 12.23 | -3.3 | | Q | | 3 | | Ace McCarthy | (Sutton & District AC) | 12.45 | -3.3 | | Q | | 4 | | Alex Gooch | (Aldershot, Farnham & District AC) | 12.69 | -3.3 | | Q | | 5 | | Anthony Flanagan | (Herne Hill Harriers) | 13.03 | -3.3 | | q | | 6 | | Troy Reid | (Belgrave Harriers) | 13.06 | -3.3 | | q | | 7 | | Oscar Tyrrell | (Kingston AC & Polytechnic Harriers) | 13.32 | -3.3 | | | | 8 | | Hayden Young | (Reigate Priory AC) | 13.38 | -3.3 | | | |
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| Under-15 Boys 100 Metres HEAT 3 (Kingsmeadow Stadium, 25 May) | 1 | | Kishon Allen | (Herne Hill Harriers) | 11.87 | -3.7 | | Q | | 2 | | Kyle Cranston | (Herne Hill Harriers) | 12.38 | -3.7 | | Q | | 3 | | George Stokes | (Sutton & District AC) | 12.50 | -3.7 | | Q | | 4 | | Reegan Boyce | (Croydon Harriers) | 12.68 | -3.7 | | Q | | 5 | | Jamie Howard | (Kingston AC & Polytechnic Harriers) | 12.69 | -3.7 | | q | |
| | | Under-15 Boys 100 Metres S-FINAL 1 (Kingsmeadow Stadium, 25 May) | 1 | | Cathan Marcell | (Herne Hill Harriers) | 11.92 | -1.8 | | Q | | 2 | | Chuks Ajeh | (Croydon Harriers) | 12.07 | -1.8 | | Q | | 3 | | Ace McCarthy | (Sutton & District AC) | 12.12 | -1.8 | | Q | | 4 | | Ade Adeniran | (Herne Hill Harriers) | 12.24 | -1.8 | | Q | | 5 | | Alex Gooch | (Aldershot, Farnham & District AC) | 12.37 | -1.8 | | | | 6 | | George Stokes | (Sutton & District AC) | 12.37 | -1.8 | | | | 7 | | Tom McGachie | (Dorking Mole Valley AC) | 12.59 | -1.8 | | | | 8 | | Troy Reid | (Belgrave Harriers) | 12.71 | -1.8 | | | |
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| Under-15 Boys 100 Metres S-FINAL 2 (Kingsmeadow Stadium, 25 May) | 1 | | Kishon Allen | (Herne Hill Harriers) | 11.66 | -2.4 | | Q | | 2 | | Emmanuel Adeoye | (South London Harriers) | 12.30 | -2.4 | | Q | | 3 | | Kyle Cranston | (Herne Hill Harriers) | 12.31 | -2.4 | | Q | | 4 | | Eric Sarfo | (Sutton & District AC) | 12.50 | -2.4 | | Q | | 5 | | Harry Holmes-Davies | (St Mary's Richmond AC) | 12.54 | -2.4 | | | | 6 | | Reegan Boyce | (Croydon Harriers) | 12.69 | -2.4 | | | | 7 | | Anthony Flanagan | (Herne Hill Harriers) | 12.91 | -2.4 | | | | | | Jamie Howard | (Kingston AC & Polytechnic Harriers) | DNS | -2.4 | | | |
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