EVENT 507 Female 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 1 | Lily Steel | 14 | | teamipswich | 1:09.99 |
| 3 | 3 | Eloise Conway | 24 | | Halstead | 1:09.94 |
| 4 | 5 | Jasmine Scott | 13 | | Co St Albans | 1:09.60 |
| 5 | 4 | Teah Gregory | 16 | | Stevenage | 1:09.66 |
| 6 | 2 | Scarlett Joslin | 17 | | Co Cambridge | 1:09.94 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 7 | Holly Enright | 17 | | Watford SC | 1:09.01 |
| 2 | 9 | Honor Beverstock | 15 | | Hatfield | 1:09.00 |
| 3 | 11 | Eleanor McLeod | 16 | | Putteridge | 1:08.90 |
| 4 | 13 | Louise Webster | 17 | | Thurrock | 1:08.60 |
| 5 | 12 | Mia Macklin | 16 | | Braintree | 1:08.87 |
| 6 | 10 | Kitty Lamb | 13 | | Co Peterboro | 1:09.00 |
| 7 | 8 | I Stratton-Thomsett | 15 | | Colchester | 1:09.00 |
| 8 | 6 | Lois Smith | 14 | | Basildon Ph | 1:09.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 15 | Isabella Porzio | 20 | | Putteridge | 1:08.30 |
| 2 | 17 | Summer Evason | 15 | | Watford SC | 1:08.15 |
| 3 | 19 | Melike Dagdelen | 15 | | Putteridge | 1:07.80 |
| 4 | 21 | Lucy Clarke | 14 | | Chelmsford | 1:07.60 |
| 5 | 20 | Evie Greenhalf | 14 | | Co Norwich | 1:07.60 |
| 6 | 18 | Ruby-May Ciaburro | 14 | | Watford SC | 1:07.89 |
| 7 | 16 | Bryony Thornton | 18 | | Co Cambridge | 1:08.26 |
| 8 | 14 | Hollie Gilbertson | 15 | | Co Norwich | 1:08.53 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 23 | Chloe Armstrong | 17 | | teamipswich | 1:07.20 |
| 2 | 25 | Genevieve White | 16 | | Co Cambridge | 1:07.20 |
| 3 | 27 | Alexandra Nurney | 14 | | Hatfield | 1:07.00 |
| 4 | 29 | Amy Boreham | 18 | | Watford SC | 1:06.22 |
| 5 | 28 | Emily Pitcher | 16 | | Norwich Swan | 1:06.66 |
| 6 | 26 | Kate Hopper | 17 | | Watford SC | 1:07.11 |
| 7 | 24 | Lexie Sandiford | 13 | | Putteridge | 1:07.20 |
| 8 | 22 | Ayla Zolfaghari | 13 | | Epping For't | 1:07.59 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 33 | Jessica Medlicott | 17 | | Dunstable | 1:05.90 |
| 2 | 39 | Ruby Greenhalf | 19 | | Co Norwich | 1:04.70 |
| 3 | 45 | Chloe Butler | 20 | | Co Norwich | 1:03.50 |
| 4 | 51 | Georgia Holgate | 17 | | Co Cambridge | 1:01.74 |
| 5 | 48 | Grace Greenhalf | 17 | | Co Norwich | 1:02.80 |
| 6 | 42 | Millie Harris | 16 | | West Norfolk | 1:04.00 |
| 7 | 36 | Ever Ives | 15 | | Hatfield | 1:04.90 |
| 8 | 30 | Hollie Hawkins | 17 | | Basildon Ph | 1:06.20 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 34 | Alexa Mann | 18 | | DunmowAtlant | 1:05.90 |
| 2 | 40 | Vanesa Cimermanova | 16 | | Co Peterboro | 1:04.44 |
| 3 | 46 | Sadie Hunter | 16 | | Co Peterboro | 1:03.10 |
| 4 | 52 | Charlotte Smith | 17 | | Norwich Swan | 1:01.40 |
| 5 | 49 | Amelia Fenner | 14 | | Basildon Ph | 1:02.80 |
| 6 | 43 | Olivia Minett | 16 | | Co Peterboro | 1:03.90 |
| 7 | 37 | Megan Pye | 22 | | Co Norwich | 1:04.80 |
| 8 | 31 | Isobel Mather | 17 | | Co Cambridge | 1:06.20 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 35 | Jessica-Jane Applegate | 28 | S14 | Co Norwich | 1:05.70 |
| 2 | 41 | Olivia Greenall | 15 | | Co Norwich | 1:04.01 |
| 3 | 47 | Emma Fields | 18 | | Bishop Stort | 1:03.00 |
| 4 | 53 | Skye Carter | 17 | | Basildon Ph | 59.80 |
| 5 | 50 | Eloise Cole | 16 | | Bedford SS | 1:01.90 |
| 6 | 44 | Sophie Palmer | 15 | | Basildon Ph | 1:03.80 |
| 7 | 38 | Anouk Zecchini | 18 | | Co Cambridge | 1:04.70 |
| 8 | 32 | Poppy Magill | 16 | | Putteridge | 1:06.14 |