EVENT 104 Womens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 2 | 1 | Rosanna Arnold | 00 | Thanet Swim | 5:01.49 |
| 3 | 3 | Jessica Thomson | 99 | Co Aberdeen | 5:01.12 |
| 4 | 5 | Tara Haworth | 99 | Lincoln Vulc | 4:59.55 |
| 5 | 4 | Niamh Hofland | 02 | Royal Wolv | 5:00.77 |
| 6 | 2 | Nikki Miller | 00 | Eastkilbride | 5:01.28 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 7 | Lara Bate | 00 | Co Manch Aq | 4:59.45 |
| 2 | 9 | Jennifer King | 98 | Eastkilbride | 4:57.59 |
| 3 | 11 | Kate Macphee | 99 | Newcastle | 4:57.11 |
| 4 | 13 | Sophia Wilson | 01 | Guildford Ct | 4:56.25 |
| 5 | 12 | Lily West | 97 | Bath Univ | 4:56.88 |
| 6 | 10 | Lauren Wray | 95 | Loughboro Un | 4:57.43 |
| 7 | 8 | Isabel Jones | 00 | Millfield | 4:59.09 |
| 8 | 6 | Isobel Meikle | 99 | Co Manch Aq | 4:59.48 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 15 | Ciara Schlosshan | 01 | Co Leeds | 4:56.21 |
| 2 | 17 | Amy Bell | 00 | Co Sheffield | 4:55.40 |
| 3 | 19 | Niamh Robinson | 99 | Pioneer 79 | 4:54.55 |
| 4 | 21 | Isobel Griffiths | 99 | Co Birm'ham | 4:53.72 |
| 5 | 20 | Emma Day | 97 | Loughboro Un | 4:53.94 |
| 6 | 18 | Niamh McDonagh | 99 | Bo Stockton | 4:54.64 |
| 7 | 16 | Daniella Whiting | 97 | Aquae Sulis | 4:55.81 |
| 8 | 14 | Chanel Sneddon | 99 | F.I.R.S.T. | 4:56.23 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 24 | Chloe Hannam | 96 | Co Peterboro | 4:53.04 |
| 2 | 28 | Orla Adams | 95 | Garioch | 4:50.60 |
| 3 | 32 | Emily Siebrecht | 97 | Bath Univ | 4:43.44 |
| 4 | 36 | Aimee Willmott | 93 | London Aquat | 4:33.66 |
| 5 | 34 | Georgia Coates | 99 | Co Leeds | 4:39.94 |
| 6 | 30 | Amber Keegan | 97 | Co Sheffield | 4:45.33 |
| 7 | 26 | Constance Dean | 98 | Maidenhead | 4:52.15 |
| 8 | 22 | Emily Large | 01 | Newcastle | 4:53.39 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 25 | Molly Roodhouse | 99 | Stockport Mo | 4:52.42 |
| 2 | 29 | Candice Hall | 97 | Co Leicester | 4:48.11 |
| 3 | 33 | Abbie Wood | 99 | Loughboro Un | 4:41.97 |
| 4 | 37 | Hannah Miley | 89 | Garioch | 4:32.16 |
| 5 | 35 | Rosie Rudin | 98 | Nova Cent'n | 4:39.01 |
| 6 | 31 | Lucy McKenzie | 97 | Stockport Mo | 4:45.22 |
| 7 | 27 | Abigail Humphreys | 98 | Co Coventry | 4:51.12 |
| 8 | 23 | Sophie Hobbah | 01 | Co Leeds | 4:53.16 |