EVENT 504 Womens Open 50m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 1 | Laura Stephens | 99 | Colchester | 28.95 |
| 1 | 7 | Olivia Askew | 97 | Co Salford | 28.86 |
| 2 | 13 | Fiona Donnelly | 95 | Nova Cent'n | 28.23 |
| 3 | 19 | Raquel Matos | 96 | East Lothian | 27.69 |
| 4 | 25 | Emma Wilkins | 91 | Loughboro Un | 26.90 |
| 5 | 22 | Sian Harkin | 94 | Plymouth Lea | 27.27 |
| 6 | 16 | Fiona Hardie | 94 | Poole | 28.01 |
| 7 | 10 | Isabella Centeleghe | 96 | Satellite | 28.69 |
| 8 | 4 | Laura Dawson | 93 | Tynemouth | 28.91 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 2 | Gillian Clark | 96 | East Lothian | 28.94 |
| 1 | 8 | Lauren Mills | 97 | Stockport Mo | 28.85 |
| 2 | 14 | Sophie Smith | 94 | Loughboro Un | 28.21 |
| 3 | 20 | Tilly Gray | 91 | Loughboro Un | 27.46 |
| 4 | 26 | Jemma Lowe | 90 | Swansea Uni | 26.89 |
| 5 | 23 | Rachael Kelly | 94 | Loughboro Un | 27.26 |
| 6 | 17 | Elena Sheridan | 95 | Romford Town | 27.97 |
| 7 | 11 | Emily Jones | 95 | Aberdeen | 28.41 |
| 8 | 5 | Sian Morgan | 94 | Edinburgh Un | 28.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 3 | Brearnna Close | 97 | Co Manch Aq | 28.92 |
| 1 | 9 | Rosie Moore | 98 | Wirral Metro | 28.85 |
| 2 | 15 | Grace Vertigans | 96 | Plymouth Lea | 28.02 |
| 3 | 21 | Ellen Thomas | 94 | Guildford Ct | 27.43 |
| 4 | 27 | Francesca Halsall | 90 | Loughboro Un | 26.00 |
| 5 | 24 | Siobhan-Marie O'Connor | 95 | Bath Univ | 27.09 |
| 6 | 18 | Georgia Barton | 95 | Co Manch Aq | 27.95 |
| 7 | 12 | Rachel Sharples | 96 | East Lothian | 28.27 |
| 8 | 6 | Megan Donnelly | 94 | Milngavie &B | 28.87 |