EVENT 4 Mixed 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Oliver TWEDDLE | 11 | South Holder | 59:00.00 |
| 2 | 3 | Harry WREATHALL | 9 | South Holder | 3:15.40 |
| 3 | 2 | Myer CHADWICK | 11 | South Holder | 3:15.88 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Liam BOWERS | 12 | South Holder | 2:19.01 |
| 2 | 7 | Dexter CHARLES | 11 | South Holder | 2:01.51 |
| 3 | 6 | Alexander SINCLAIR | 10 | South Holder | 2:03.01 |
| 4 | 4 | Betsy SANDERSON | 11 | South Holder | 2:25.92 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Isla TURNBULL | 12 | South Holder | 1:53.00 |
| 2 | 11 | Andrew MOORE | 11 | South Holder | 1:47.32 |
| 3 | 10 | Freya PEERS | 13 | South Holder | 1:51.39 |
| 4 | 8 | WALTER DOWSON | 9 | Pocklington | 1:55.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | SOPHIE HEASMAN | 14 | Bridlington | 1:46.90 |
| 2 | 15 | RORY RASTALL | 10 | Pocklington | 1:45.89 |
| 3 | 14 | HANNA KWIATEK | 11 | Bridlington | 1:46.40 |
| 4 | 12 | DOMINIC VIDANAPATIRANA | 11 | Pocklington | 1:47.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | ALBERT DOWSON | 11 | Pocklington | 1:42.00 |
| 2 | 19 | AIDAN BLADES | 13 | Bridlington | 1:38.91 |
| 3 | 18 | Robert CHRISTON | 13 | South Holder | 1:39.32 |
| 4 | 16 | JASMINE OXFORD | 11 | Pocklington | 1:43.89 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Abigail MOORE | 16 | South Holder | 1:33.94 |
| 2 | 23 | Benjamin ROBERTS | 14 | South Holder | 1:17.70 |
| 3 | 22 | Billy LIMON | 14 | South Holder | 1:33.59 |
| 4 | 20 | ERYNNE MINAHAN | 14 | Bridlington | 1:35.62 |