EVENT 3 Boy Open 100m Backstroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 1 | Charlie GREEN | 12 | S Bournem'th | 1:44.19 |
| 3 | 2 | Alfie POLLARD | 12 | S Bournem'th | 1:42.23 |
| 4 | 3 | Harry HENSHAW | 12 | West Dorset | 1:38.27 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 4 | Teddy KEEP | 12 | Poole | 1:37.44 |
| 3 | 5 | Toby SIMS | 13 | Seagulls SC | 1:35.83 |
| 4 | 6 | Luca SLOAN | 13 | Weymouth | 1:34.82 |
| 5 | 7 | Rohan VERCOE | 12 | Bridport Bar | 1:34.13 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 8 | Kit FREEMAN | 11 | Blandford | 1:29.34 |
| 2 | 9 | Jenson LOWE | 12 | Poole | 1:28.52 |
| 3 | 10 | Harry JOHNSON | 10 | Blandford | 1:28.22 |
| 4 | 11 | Brodie ROBERTS | 12 | Seagulls SC | 1:27.64 |
| 5 | 12 | Coby YOUNG | 11 | Poole | 1:26.90 |
| 6 | 13 | Henry WALKER | 11 | Poole | 1:25.52 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 14 | James FLEMING | 11 | S Bournem'th | 1:25.16 |
| 2 | 15 | Billy LEWIS | 10 | S Bournem'th | 1:24.01 |
| 3 | 16 | Liam DETRICK | 10 | Poole | 1:23.98 |
| 4 | 17 | Euan MCPHAIL | 10 | West Dorset | 1:23.71 |
| 5 | 18 | Gethin WILSON | 10 | Poole | 1:22.99 |
| 6 | 19 | Alfie CRANE | 10 | Seagulls SC | 1:22.48 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 20 | Tommy GLEESON | 10 | Seagulls SC | 1:22.44 |
| 2 | 21 | Nicolas GBUREK | 09 | Weymouth | 1:22.42 |
| 3 | 22 | Archie RAND | 10 | Seagulls SC | 1:22.02 |
| 4 | 23 | Samuel ESCOTT | 10 | Poole | 1:21.48 |
| 5 | 24 | Finlay LAWS | 10 | S Bournem'th | 1:21.35 |
| 6 | 25 | Leo IBBOTSON | 10 | Wareham | 1:19.35 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 27 | Elliot WARE | 09 | S Bournem'th | 1:16.85 |
| 2 | 29 | Jacka WARE | 07 | S Bournem'th | 1:15.68 |
| 3 | 31 | Daniel HUSSEY | 07 | Bridport Bar | 1:07.18 |
| 4 | 30 | Kieran BARTON | 08 | Wareham | 1:13.31 |
| 5 | 28 | Miron WOZNIAK | 09 | Blandford | 1:16.29 |
| 6 | 26 | James NEESAM | 08 | Poole | 1:17.12 |