EVENT 613 Female 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 2 | Mollie SMART | 14 | Coalville | 1:36.23 |
| 2 | 4 | Hollie WILLARS | 13 | Braunstone | 1:27.39 |
| 3 | 7 | Elsie BALDWIN | 13 | Hinckley | 1:25.67 |
| 4 | 9 | Charlotte LUCAS | 13 | Braunstone | 1:23.55 |
| 5 | 8 | Amelie ARMITAGE | 13 | Leic Sharks | 1:24.00 |
| 6 | 5 | Isla FOWLER | 13 | Coalville | 1:27.39 |
| 7 | 3 | Violet BLACKETT | 13 | Hinckley | 1:29.51 |
| 8 | 1 | Willow HIBBITT | 15 | Melton M'bry | 1:46.15 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 11 | Ivy LOWE | 12 | Leicester Ne | 1:22.70 |
| 2 | 14 | Sophie BRUTNALL | 11 | Market Har | 1:21.79 |
| 3 | 16 | Katherine FLETCHER | 13 | Loughborough | 1:21.42 |
| 4 | 18 | Hollie COWLES | 11 | Braunstone | 1:21.21 |
| 5 | 17 | Ivy BROWN | 12 | Melton M'bry | 1:21.38 |
| 6 | 15 | Elsbeth WILLIAMS | 12 | Market Har | 1:21.78 |
| 7 | 12 | Niamh SHEARN | 11 | Market Har | 1:22.06 |
| 8 | 10 | Shivani SHARMA | 13 | Braunstone | 1:22.96 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 20 | Jessica PURSER | 11 | Braunstone | 1:20.23 |
| 2 | 23 | Eleanor TRAHEARN | 09 | Hinckley | 1:18.46 |
| 3 | 25 | Peta MORLEY | 11 | Hinckley | 1:17.74 |
| 4 | 27 | Jasmeen SINGH | 11 | Hinckley | 1:17.34 |
| 5 | 26 | Marta UCIECHA | 10 | Leicester Ne | 1:17.50 |
| 6 | 24 | Olivia WILES | 00 | Leic Peng | 1:18.28 |
| 7 | 22 | Emily COWLES | 06 | Braunstone | 1:18.92 |
| 8 | 19 | Kirsten ULPH | 10 | Leicester Ne | 1:21.02 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 29 | Eve BURDON | 09 | Market Har | 1:16.19 |
| 2 | 32 | Alexa MASON | 11 | Hinckley | 1:14.80 |
| 3 | 35 | Sophie LANE | 12 | Leic Sharks | 1:14.01 |
| 4 | 37 | Sarah DEW | 07 | Leic Sharks | 1:13.13 |
| 5 | 36 | Megan BLAIR | 11 | Coalville | 1:13.70 |
| 6 | 33 | Sophia TSINONTAS | 10 | Leic Sharks | 1:14.61 |
| 7 | 31 | Abigail GOLYNKER | 10 | Leic Sharks | 1:15.28 |
| 8 | 28 | Emilia DURRINGTON | 10 | Braunstone | 1:16.40 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 41 | Holly GENT | 11 | Coalville | 1:11.63 |
| 2 | 47 | Poppy SCOTCHBROOK | 07 | Braunstone | 1:10.01 |
| 3 | 53 | Anna CLARKE | 09 | Leic Peng | 1:08.63 |
| 4 | 60 | Francesca HARRISON | 09 | Braunstone | 1:04.40 |
| 5 | 57 | Alice BALL | 97 | Market Har | 1:07.39 |
| 6 | 50 | Julia JOZWIAK | 08 | Leic Sharks | 1:09.41 |
| 7 | 44 | Evie COBURN | 09 | Melton M'bry | 1:11.07 |
| 8 | 38 | Ava HARVEY | 09 | Leic Sharks | 1:13.02 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 42 | Chloe GENT | 10 | Coalville | 1:11.55 |
| 2 | 48 | Francesca PALFREY | 06 | Loughborough | 1:09.91 |
| 3 | 54 | Amy WILLETTS | 07 | Melton M'bry | 1:08.48 |
| 4 | 61 | Janie FINCH | 10 | Hinckley | 1:03.12 |
| 5 | 58 | Jessica LINES | 09 | Leic Sharks | 1:06.63 |
| 6 | 51 | Dorothy PLUMPTON | 09 | Braunstone | 1:09.37 |
| 7 | 45 | Elizabeth PALFREY | 08 | Loughborough | 1:10.49 |
| 8 | 39 | Catherine YATES | 10 | Loughborough | 1:12.84 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 43 | Olivia FAUSTMANN | 11 | Leic Sharks | 1:11.10 |
| 2 | 49 | Sofia REEDHA | 11 | Braunstone | 1:09.74 |
| 3 | 55 | Chiara REEDHA | 09 | Braunstone | 1:08.35 |
| 4 | 62 | Alyssa LO | 08 | Braunstone | 1:02.30 |
| 5 | 59 | Darcie PLATTS | 08 | Braunstone | 1:05.00 |
| 6 | 52 | Evie WOOD | 02 | Braunstone | 1:08.84 |
| 7 | 46 | Chloe MORLEY | 12 | Coalville | 1:10.38 |
| 8 | 40 | Emily HEWITT | 10 | Hinckley | 1:11.77 |