| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 2 | Georgia MIDDLETON | 12 | Louth Dolphins SC | 3:01.64 |
| 4 | 4 | Emilie WEBB | 10 | Grantham SC | 2:34.57 |
| 5 | 3 | Erin ARCHER | 11 | City of Linc Pentaqua SC | 2:46.41 |
| 6 | 1 | Miley RICHARDSON | 13 | Lincoln Vulcans SC | 3:06.85 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 6 | Maisie MATTHEWS | 11 | Louth Dolphins SC | 2:33.45 |
| 2 | 8 | Emily TALKES | 12 | Lincoln Vulcans SC | 2:33.14 |
| 3 | 10 | Amy PALMER | 11 | City of Linc Pentaqua SC | 2:32.41 |
| 4 | 12 | Kitty LAMB | 11 | South Lincs Competitive SC | 2:31.10 |
| 5 | 11 | Megan LAMB | 09 | Lincoln Vulcans SC | 2:31.89 |
| 6 | 9 | Skye HOLMES | 10 | Louth Dolphins SC | 2:32.66 |
| 7 | 7 | Elysia SMITH | 10 | Louth Dolphins SC | 2:33.23 |
| 8 | 5 | Isla GRAY | 10 | Grantham SC | 2:33.61 |
| Heat Number - 3 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 14 | Sophie COOKSEY | 10 | Louth Dolphins SC | 2:29.86 |
| 2 | 16 | Gracie-May COLE | 08 | City of Linc Pentaqua SC | 2:28.36 |
| 3 | 18 | Sigourney BOLTON | 09 | South Lincs Competitive SC | 2:28.03 |
| 4 | 20 | Taliah COUTTS | 08 | City of Linc Pentaqua SC | 2:27.29 |
| 5 | 19 | Rosie HICKS | 06 | Lincoln Vulcans SC | 2:27.65 |
| 6 | 17 | Lexie HAMILTON | 09 | South Lincs Competitive SC | 2:28.20 |
| 7 | 15 | Rianna ABBOTT | 08 | Grantham SC | 2:29.66 |
| 8 | 13 | Emmy STINTON | 09 | City of Linc Pentaqua SC | 2:30.70 |
| Heat Number - 4 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 22 | Lucy WILSON | 10 | South Lincs Competitive SC | 2:26.13 |
| 2 | 24 | Florrie HENSMAN | 09 | Louth Dolphins SC | 2:25.84 |
| 3 | 26 | Penelope BAXTER | 05 | Deepings SC | 2:25.68 |
| 4 | 28 | Holly GILES | 06 | Louth Dolphins SC | 2:25.20 |
| 5 | 27 | Samantha MACIJAUSKAITE | 05 | Boston Amateur SC | 2:25.47 |
| 6 | 25 | Corey FARLEY | 09 | Grantham SC | 2:25.74 |
| 7 | 23 | Isabelle MCCORKELL | 08 | Gainsborough Dolphins SC | 2:26.04 |
| 8 | 21 | Sophie MORSY | 07 | Boston Amateur SC | 2:27.00 |
| Heat Number - 5 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 30 | Tiegan GRAY | 07 | Gainsborough Dolphins SC | 2:23.42 |
| 2 | 32 | Erin INGHAM | 08 | Louth Dolphins SC | 2:22.66 |
| 3 | 34 | Evie LILLEY | 09 | Lincoln Vulcans SC | 2:21.70 |
| 4 | 36 | Zara DIXON | 08 | City of Linc Pentaqua SC | 2:21.23 |
| 5 | 35 | Amelia CHRISPIN | 05 | Lincoln Vulcans SC | 2:21.66 |
| 6 | 33 | Madeleine SMIRTHWAITE | 08 | City of Linc Pentaqua SC | 2:22.54 |
| 7 | 31 | Charlotte BEMROSE | 08 | Louth Dolphins SC | 2:23.07 |
| 8 | 29 | Helena FIELD | 09 | Louth Dolphins SC | 2:23.63 |
| Heat Number - 6 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 38 | Evelyn JACKSON | 08 | Lincoln Vulcans SC | 2:20.47 |
| 2 | 40 | Lillie HAMILTON | 08 | South Lincs Competitive SC | 2:19.89 |
| 3 | 42 | Elena ALDENHOFF-KELLY | 08 | Grantham SC | 2:19.31 |
| 4 | 44 | Hannah BRUCE | 09 | South Lincs Competitive SC | 2:18.36 |
| 5 | 43 | Alexandra HALLAM-STOTT | 06 | Grantham SC | 2:19.12 |
| 6 | 41 | Ruby WARING | 06 | Louth Dolphins SC | 2:19.76 |
| 7 | 39 | Lilli-Rose CARR | 09 | City of Linc Pentaqua SC | 2:20.30 |
| 8 | 37 | Lilli BOWMAN | 07 | South Lincs Competitive SC | 2:21.18 |
| Heat Number - 7 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 46 | Evie DICKINSON | 08 | Louth Dolphins SC | 2:18.19 |
| 2 | 48 | Millie HERRICK | 07 | Deepings SC | 2:17.30 |
| 3 | 50 | Grace MACDONALD | 09 | Grantham SC | 2:16.28 |
| 4 | 52 | Jessica O'HERLIHY | 06 | South Lincs Competitive SC | 2:14.40 |
| 5 | 51 | Francesca HALLAM-STOTT | 07 | Grantham SC | 2:14.50 |
| 6 | 49 | Olivia ANSTEY | 08 | Louth Dolphins SC | 2:16.63 |
| 7 | 47 | Katie ROSCOE | 03 | Louth Dolphins SC | 2:17.71 |
| 8 | 45 | Charlotte HODGIN | 08 | City of Linc Pentaqua SC | 2:18.24 |
| Heat Number - 8 | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 54 | Katie MALONEY | 97 | Lincoln Vulcans SC | 2:13.30 |
| 2 | 56 | Chloe HOPKINSON | 05 | Grantham SC | 2:12.09 |
| 3 | 58 | Mollie BRIGGS | 05 | South Lincs Competitive SC | 2:10.58 |
| 4 | 60 | Emma CROKER | 05 | South Lincs Competitive SC | 2:01.10 |
| 5 | 59 | Alexandra BULAT | 06 | Lincoln Vulcans SC | 2:03.90 |
| 6 | 57 | Charlotte WRIGHT | 05 | Louth Dolphins SC | 2:10.83 |
| 7 | 55 | Grace TURNER | 07 | Grantham SC | 2:12.20 |
| 8 | 53 | Beatrice FINCH | 06 | South Lincs Competitive SC | 2:14.00 |