EVENT 305 Female 12 /Under 50m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Beatrix SHEPPARD | 9 | Grantham | 1:30.00 |
| 4 | 2 | Norah GIBSON | 11 | Grantham | 1:30.00 |
| 5 | 3 | Charlotte DAVIES | 10 | Deepings | 1:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Polina KUDRIAVETS | 10 | Deepings | 1:30.00 |
| 2 | 7 | Sienna GREEN | 11 | Co Lincoln P | 1:11.78 |
| 3 | 8 | Erin SMITH | 10 | Deepings | 1:10.39 |
| 4 | 9 | Ada HUGHES | 10 | Co Lincoln P | 1:10.02 |
| 5 | 11 | Layla MERRICK | 11 | Co Lincoln P | 1:08.56 |
| 6 | 12 | Tabitha LAMBERT | 10 | Lincoln Vulc | 1:07.30 |
| 7 | 13 | Imola HARRIS | 9 | Grantham | 1:06.12 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Tabitha GODDARD | 9 | Grantham | 1:06.09 |
| 2 | 15 | F FRASER-CATTANACH | 12 | Lincoln Vulc | 1:05.98 |
| 3 | 17 | Elsie WENTWORTH | 11 | Lincoln Vulc | 1:04.71 |
| 4 | 20 | Seren TWINLEY | 10 | Deepings | 1:03.33 |
| 5 | 21 | Chloe BERNERS | 12 | Deepings | 1:03.29 |
| 6 | 22 | Martha WILLIAMS | 9 | Lincoln Vulc | 1:02.69 |
| 7 | 23 | Bethany MEAKIN | 11 | Grantham | 1:02.58 |
| 8 | 24 | Harriet HOLLOWAY | 11 | Deepings | 1:01.49 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Florence MCCANN | 9 | Lincoln Vulc | 1:01.40 |
| 2 | 26 | Cecily THOMPSON | 9 | Lincoln Vulc | 1:01.32 |
| 3 | 27 | Sophia WRIGHT | 10 | Grantham | 1:00.93 |
| 4 | 29 | Felicity MARSHALL | 12 | Deepings | 1:00.61 |
| 5 | 30 | Lillian ROBSON | 11 | Lincoln Vulc | 1:00.04 |
| 6 | 31 | Emelia BARTON | 9 | Lincoln Vulc | 59.93 |
| 7 | 33 | Megan PERKIN | 11 | Lincoln Vulc | 57.39 |
| 8 | 34 | Matilda HARPER | 10 | Grantham | 57.38 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 35 | Gracie PAYNE | 12 | Grantham | 56.98 |
| 2 | 36 | Georgia HUNT | 10 | Grantham | 56.66 |
| 3 | 37 | A HATCHER BRENNAN | 11 | Deepings | 56.22 |
| 4 | 38 | Mya LAMBERT | 10 | Co Lincoln P | 55.48 |
| 5 | 39 | Yu Tsing (Trixie) CHEU | 12 | Grantham | 55.43 |
| 6 | 41 | Georgia BELLETT | 11 | Grantham | 54.62 |
| 7 | 42 | Martha SMITH | 10 | Co Lincoln P | 54.45 |
| 8 | 43 | Seren EVANS | 11 | Co Lincoln P | 54.29 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 44 | Ginny PARNHAM | 12 | Lincoln Vulc | 54.16 |
| 2 | 46 | Jasmine HOLDER | 11 | Gainsborough | 53.44 |
| 3 | 47 | Evelyn LITTLE | 11 | Lincoln Vulc | 53.21 |
| 4 | 49 | Halla ALY | 12 | Lincoln Vulc | 53.05 |
| 5 | 50 | Ada PAGE | 10 | Grantham | 53.01 |
| 6 | 51 | Hollie FORSYTH | 10 | Lincoln Vulc | 52.83 |
| 7 | 53 | Gracie DAWSON | 12 | Deepings | 52.03 |
| 8 | 54 | Esme EVANS | 12 | Grantham | 51.78 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 55 | Martha WOOD | 9 | Grantham | 51.40 |
| 2 | 56 | Mia WILLIAMS | 12 | Lincoln Vulc | 51.38 |
| 3 | 57 | Victoria MCKAY | 12 | Gainsborough | 51.37 |
| 4 | 58 | Ophelia GOODALE | 11 | Deepings | 51.36 |
| 5 | 59 | Amy STEPHENSON | 11 | Co Lincoln P | 51.35 |
| 6 | 61 | Rebecca BATISTA | 10 | Co Lincoln P | 51.34 |
| 7 | 62 | Hallie ELLIS-HYMAN | 10 | Lincoln Vulc | 51.10 |
| 8 | 63 | Gabriella HAYES | 11 | NottmLeander | 51.06 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 64 | Tilly WASKETT-BOOTH | 10 | Grantham | 50.76 |
| 2 | 65 | Lydia EVANS | 12 | Co Lincoln P | 50.59 |
| 3 | 66 | Emily CLAYTON | 12 | Grantham | 50.38 |
| 4 | 67 | Evangeline KINNEAR | 12 | Grantham | 50.20 |
| 5 | 68 | Chloe APPLEWHITE | 10 | Gainsborough | 49.99 |
| 6 | 69 | Evelyn NICHOLLS | 12 | Grantham | 49.98 |
| 7 | 70 | Abigail WORTHINGTON | 12 | Lincoln Vulc | 49.93 |
| 8 | 71 | Tilly ROTHWELL | 11 | Co Lincoln P | 49.74 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 72 | C TOH-GRUDZINSKI | 10 | Lincoln Vulc | 49.47 |
| 2 | 73 | Eleanor DE ROSE | 12 | Deepings | 49.18 |
| 3 | 74 | Lucy MARTIN | 10 | Lincoln Vulc | 48.90 |
| 4 | 75 | Emmeline GLEAVE | 10 | Grantham | 48.80 |
| 5 | 76 | Florence HIPPISLEY | 12 | Co Lincoln P | 48.79 |
| 6 | 77 | Niamh KERRIGAN | 12 | Co Lincoln P | 48.77 |
| 7 | 78 | Amaya MONTEALEGRE | 12 | Lincoln Vulc | 48.49 |
| 8 | 79 | Poppy-Rose WILSON | 11 | Deepings | 48.45 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 80 | Abigail TAYLOR | 12 | Grantham | 48.20 |
| 2 | 81 | Chloe GOACHER | 12 | Grantham | 48.18 |
| 3 | 82 | Matilda KOS | 11 | Co Lincoln P | 48.08 |
| 4 | 83 | Jasmine CHEETHAM | 12 | Lincoln Vulc | 47.67 |
| 5 | 84 | Annabel HILLSON | 11 | Grantham | 46.97 |
| 6 | 85 | Ava MORGAN | 12 | Co Lincoln P | 46.83 |
| 7 | 86 | Francesca WESTON | 11 | Grantham | 46.31 |
| 8 | 87 | Eva MADDISON | 11 | Co Lincoln P | 45.98 |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 88 | Isla ROBINSON | 12 | Co Lincoln P | 45.76 |
| 2 | 89 | Caitlin BOWLES | 12 | Gainsborough | 45.73 |
| 3 | 90 | Ruby TALKES | 10 | Lincoln Vulc | 45.26 |
| 4 | 91 | Esme APPLEWHITE | 12 | Gainsborough | 44.86 |
| 5 | 92 | Hollie-Ann CROOK | 11 | Grantham | 44.64 |
| 6 | 93 | Aoife HICKEY | 12 | Deepings | 44.29 |
| 7 | 94 | Katie BEASTALL | 12 | Co Lincoln P | 44.24 |
| 8 | 95 | Honey FLOWER | 11 | Grantham | 43.96 |
| Heat Number - 12 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 97 | Colette GRANTHAM | 12 | Lincoln Vulc | 43.58 |
| 2 | 99 | Isobel DELDERFIELD | 12 | Co Lincoln P | 41.98 |
| 3 | 101 | Ella KHAMA | 12 | Grantham | 40.61 |
| 4 | 104 | Margot MARKS | 12 | Lincoln Vulc | 37.70 |
| 5 | 103 | Miley RICHARDSON | 12 | Co Lincoln P | 38.11 |
| 6 | 100 | Caitlynn EDMEADES | 12 | Deepings | 41.89 |
| 7 | 98 | Freya HUGHES | 12 | Co Lincoln P | 42.48 |
| 8 | 96 | Arin ELVIDGE | 12 | Lincoln Vulc | 43.90 |