EVENT 31 Women MC 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Eleanor TWINLEY | 11 | Deepings | 2:28.07 |
| 2 | 2 | Lucy JENKINSON | 10 | Deepings | 2:21.70 |
| 3 | 3 | Katherine FLETCHER | 9 | Loughborough | 2:15.00 |
| 4 | 5 | Indra DEAVES | 11 | Grantham | 2:00.00 |
| 5 | 6 | Lily-May CRANE | 11 | Grantham | 1:55.00 |
| 6 | 7 | Megan LAMB | 12 | Lincoln Vulc | 1:53.56 |
| 7 | 8 | Ellena HOWITT | 10 | Grantham | 1:50.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Charlotte JENKINSON | 11 | Deepings | 1:49.40 |
| 2 | 10 | Amy TAYLOR | 10 | Grantham | 1:42.00 |
| 3 | 11 | Harriet MCCORMACK | 12 | Grantham | 1:40.28 |
| 4 | 12 | Charlotte GILL | 13 | Grantham | 1:33.81 |
| 5 | 13 | Grace HOWITT | 13 | Grantham | 1:33.44 |
| 6 | 14 | Lucy DAVIS | 13 | Lincoln Vulc | 1:33.10 |
| 7 | 15 | Elysia SMITH | 12 | Louth | 1:29.30 |
| 8 | 16 | Sophie COOKSEY | 12 | Louth | 1:28.26 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Poppy PRICE | 11 | Louth | 1:28.13 |
| 2 | 18 | Mieke MCDONALD | 12 | Deepings | 1:27.05 |
| 3 | 19 | Catherine YATES | 12 | Loughborough | 1:25.44 |
| 4 | 20 | Emilie WEBB | 12 | Grantham | 1:25.00 |
| 5 | 21 | Isabella MIDDLETON | 13 | Louth | 1:24.20 |
| 6 | 22 | K GREENWOOD-COVELL | 14 | Deepings | 1:24.04 |
| 7 | 23 | Cora FARLEY | 13 | Grantham | 1:20.06 |
| 8 | 24 | Olivia SPENCER | 15 | Lincoln Vulc | 1:18.64 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Elizabeth PALFREY | 14 | Loughborough | 1:14.02 |
| 2 | 28 | Francesca PALFREY | 15 | Loughborough | 1:12.50 |
| 3 | 31 | Chloe HOPKINSON | 17 | Grantham | 1:08.04 |
| 4 | 33 | Charlotte WRIGHT | 16 | Louth | 1:05.70 |
| 5 | 32 | Abbie RUDDLE | 18 | Loughborough | 1:05.81 |
| 6 | 29 | Evelyn JACKSON | 13 | Lincoln Vulc | 1:12.45 |
| 7 | 27 | Sadie HUNTER | 13 | Deepings | 1:12.90 |
| 8 | 25 | Evie LILLEY | 12 | Lincoln Vulc | 1:16.70 |