| Bibno. | Participant | Category | Distance |
|---|---|---|---|
| 316 | Fynn Batkin | (M) Youth | Youth |
| 509 | Gary Donald | (M) PTWC2 | Paratriathlon |
| 490 | George Mahon | (M) TriStar 2 | Tri Star 2 |
| 526 | George Peasgood | (M) PTS5 | Paratriathlon |
| 484 | George Snow | (M) TriStar 2 | Tri Star 2 |
| 242 | Grace Goodall | (F) Youth | Youth |
| 126 | Grace Kinnell | (F) Junior 17-18 | Junior |
| 452 | Grace Nolan | (F) TriStar 2 | Tri Star 2 |
| 151 | Gregor Kelling | (M) Junior 17-18 | Junior |
| 161 | Gregory Atkins | (M) Junior 17-18 | Junior |
| 181 | Guy Evans Haggerty | (M) Junior 17-18 | Junior |
| 201 | Guy Tucker | (M) Junior 17-18 | Junior |
| 299 | Hamish Armitt | (M) Youth | Youth |
| 286 | Hamish Reilly | (M) Youth | Youth |
| 267 | Hannah Brayer | (F) Youth | Youth |
| 436 | Hannah Camden | (F) TriStar 2 | Tri Star 2 |
| 117 | Hannah Louise Jenkins | (F) Junior 17-18 | Junior |
| 364 | Hannah Mitchell | (F) TriStar 3 | Tri Star 3 |
| 523 | Hannah Moore | (F) PTS4 | Paratriathlon |
| 418 | Harry Butterworth | (M) TriStar 3 | Tri Star 3 |
| 474 | Harry Courtney | (M) TriStar 2 | Tri Star 2 |
| 394 | Harry Morris | (M) TriStar 3 | Tri Star 3 |
| 320 | Harry O'donoghue | (M) Youth | Youth |
| 156 | Harry Purdell | (M) Junior 17-18 | Junior |
| 333 | Harvey Griffin | (M) Youth | Youth |
| 513 | Haseeb Ahmad | (M) PTVI B1 | Paratriathlon |
| 309 | Hayden Greaves | (M) Youth | Youth |
| 266 | Heather Barnes | (F) Youth | Youth |
| 222 | Helena Dyce | (F) Youth | Youth |
| 483 | Henry Pollock | (M) TriStar 2 | Tri Star 2 |
| 494 | Henry Williams | (M) TriStar 2 | Tri Star 2 |
| 138 | Hollie Elliott | (F) Junior 17-18 | Junior |
| 137 | Holly Kitching | (F) Junior 17-18 | Junior |
| 411 | Huw Jones | (M) TriStar 3 | Tri Star 3 |
| 501 | Ian Attfield | (M) PTWC2 | Paratriathlon |
| 492 | Iaon Oldfield | (M) TriStar 2 | Tri Star 2 |
| 319 | Ifan Gruff Oldfield | (M) Youth | Youth |
| 128 | Imogen Moroney | (F) Junior 17-18 | Junior |
| 120 | Iona Miller | (F) Junior 17-18 | Junior |
| 387 | Isaac Dodds | (M) TriStar 3 | Tri Star 3 |
| 230 | Isabel Atkins | (F) Youth | Youth |
| 118 | Isabel Morris | (F) Junior 17-18 | Junior |
| 232 | Isabella Penny | (F) Youth | Youth |
| 361 | Isabelle Hinkley | (F) TriStar 3 | Tri Star 3 |
| 421 | Isabelle Lester | (F) TriStar 2 | Tri Star 2 |
| 453 | Isabelle Price | (F) TriStar 2 | Tri Star 2 |
| 358 | Isla Britton | (F) TriStar 3 | Tri Star 3 |
| 438 | Isla Hedley | (F) TriStar 2 | Tri Star 2 |
| 377 | Issy Nicholls | (F) TriStar 3 | Tri Star 3 |
| 289 | Jack Kennedy | (M) Youth | Youth |
