| | | Reading School | | | | | 308658g | | |
| Abba | Roohullah | M | Whitgift School | 0 | 0 | | 293968L | | | |
| Abbineni | Mihir | M | Surrey Juniors | | 0 | | 307187L | | | |
| Abdalla | Suhayl | M | Colyton Grammar School | 1390B | 1195E | 1414K | 320060H | ME019148 | | |
| Abdalla | Madjid | M | The Cedars School | | 1060D | | 290053B | | 0 | |
| Abdelalim | Hussien | U | Nottingham HS | | | 1057P | 344219G | | 0 | |
| Abdulla | Murad | M | Scotland | 2313C | 0 | 2313K | 291190F | | 2403757 | |
| Abercrombie | Jane | | Nottingham HS | | | | | | 0 | |
| Abou-Raggah | Yassir | | Fortismere S | | | | 310471A | | 0 | |
| Abraham | Jeff | M | Abingdon School | 0 | 0 | | 279032E | | 0 | |
| Acharya | Kandara | F | Bristol GS | 116L | 114L | 1748A | 302192A | ME008485 | 460702 | |
| Acharya | Dwiti | F | Bristol Juniors | 1210D | 1413C | 1210K | 308238G | | 489131 | |
| Acmonier | Finn | | Yateley Manor School | | | | | | | |
| Adams | Henry | M | Brighton College | 1720C | 1570A | 1734K | 302456J | ME006149 | 464562 | |
| Adams | Edward | | Yarm School | 0 | 1488D | 1570K | 299153G | | 0 | |
| Adams | Victoria | | Bishops Stortford HS | | | | 313777G | | | |
| Adams | George | M | Brighton College | 1030F | 1225A | 1101K | 318918B | ME017600 | 487643 | |
| Adatia | Amar | M | Kent Junior Congresses | 1383C | 1460A | 1444K | 309402K | ME020829 | 471976 | |
| Adeniyi | Nathan | | Highgate School | | | | | | | |
| Aderuga | Toby | | St Johns Senior School | | | | | | | |
| Adeweyu | Tonoe | | Nottingham HS | | | | | | | |
| Adhiban | B | | India | 2718B | | 2718K | 297148D | | 5018471 | |
| Aditjandra | Sean | M | St Marys School Northumberland | | | 1557P | 345231B | | 0 | |
| Adjei | Israel | U | Bishops Stortford HS | | | | | | 0 | |
| Adshead | Harry | M | Surrey Juniors | | 0 | | 326022H | | 485845 | |
| Afolabi | Dami | | St Johns Senior School | | | | | | | |
| Agarwal | Aditi | F | Kent Junior Congresses | 1578E | 0 | 1578K | 314932J | | 479233 | |
| Agarwal | Aditi | F | Kent Junior Congresses | 1578E | 0 | 1578K | 314932J | | 479233 | |
| Aggarwal | Romi | | Q Elizabeth H | 0 | 0 | | 309462F | | 0 | |
| Aggarwal | Devesh | M | King Edwards School Camp Hill Birmingham | | 1345D | | 292605C | | 464430 | |
| Aggarwal | Hemal | M | King Edwards School Camp Hill Birmingham | | 1420D | | 292606E | | 464449 | |
| Aggarwal | Rohan | M | King Edwards School Camp Hill Birmingham | | 0 | | 292607G | | | |
| Aggarwal | Yana | F | King Edwards School Camp Hill Birmingham | | 0 | | 316452E | | | |
| Agnello | Primo | M | King Edwards School Camp Hill Birmingham | | 0 | | 303696A | | | |
| Agnihotri | Aaryan | M | Barnet Knights | 1495D | 1495C | 1564K | 300583F | ME000078 | 466166 | |
| Agnihotri | Akaash | M | Barnet Knights | 1495D | 1578C | 1493K | 300584H | ME000394 | 466174 | |
| Agrawal | Shivam | M | Kings College Junior School (Wimbledon) | 1976A | 1876A | 2020A | 306605J | ME014479 | 460460 | |
| Agrawal | Ansh | M | King Edwards School Birmingham | 1458D | 1653D | 1495K | 309585L | ME001438 | 473634 | |
| Agrawal | Kavish | U | Tonbridge School | | | | | | 0 | |
| Agrawal | Adrika | F | Surrey Juniors | | 708F | | 328656D | | | |
| Ahad | Monaf | M | Scotland | | 0 | | 318485H | | 0 | |
| Ahi | Josya | | Tormead Girls School | | | | | | | |
| Ahluwalia | Amardip | M | RGS Guildford | 2238B | 2125B | 2217K | 287750J | ME000967 | 437085 | |
| Ahmati | Omar | U | Bishops Stortford HS | | | | | | 0 | |
| Ahmed | Bilal | M | Q Elizabeth H | 1728A | 1683A | 1738K | 318794K | ME017444 | 0 | |
| Ahmed-Khan | Aisha | | James Allens Girls School | | | | | | 0 | |
| Aikman-Beadle | Sam | M | Surrey Juniors | | 0 | | 319604F | | | |
| Ainkaran | Lavanan | M | King Edward VI School Chelmsford | 1675E | 0 | 1675K | 297350K | | 457116 | |
| Ainsworth | William J | M | Reigate GS | 1339B | 1158E | 1331K | 306943G | | 455474 | |
| Aiyyapan | Sudersen | M | Surrey Juniors | | 0 | 1279P | 322224L | ME020416 | 481831 | |
