EVENT 203 Boy/Girl 12 /Under 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Elspeth ARCHER | 9 | Co Manch Aq | 2:19.51 |
| 3 | 4 | Marcus DENNIS | 9 | Co Leeds | 2:15.00 |
| 4 | 6 | Grace OLDHAM | 9 | Co Leeds | 2:10.00 |
| 5 | 5 | Jacob DYER | 10 | Co Leeds | 2:10.00 |
| 6 | 3 | Jessica HUSTLER | 12 | Co Manch Aq | 2:16.01 |
| 7 | 1 | Daniel RAWLINGS | 9 | Co Leeds | 2:20.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 8 | Elspeth KNOWLES | 12 | Co Leeds | 2:00.07 |
| 1 | 10 | Zoe FEATHER | 9 | Co Leeds | 2:00.00 |
| 2 | 12 | Olivia WINTERS | 9 | Co Leeds | 1:55.00 |
| 3 | 14 | Hogan LAM | 10 | Co Leeds | 1:53.20 |
| 4 | 16 | Betsy KIRKLEY | 9 | Co Leeds | 1:52.00 |
| 5 | 15 | Addison CROPPER | 9 | Co Leeds | 1:52.00 |
| 6 | 13 | Glorianna MOYNIHAN | 10 | Co Manch Aq | 1:54.98 |
| 7 | 11 | Isabel REDBURN | 10 | Co Manch Aq | 1:59.72 |
| 8 | 9 | Grace O'HARA | 10 | Co Leeds | 2:00.00 |
| 9 | 7 | Livia STACEY | 10 | Co Leeds | 2:03.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 18 | Oliver BARKER | 9 | Co Leeds | 1:50.00 |
| 1 | 20 | Harry DIXON | 9 | Co Leeds | 1:50.00 |
| 2 | 22 | Oscar HUSSEY | 10 | Co Leeds | 1:50.00 |
| 3 | 24 | Emilia ROBERTON | 11 | York City | 1:47.49 |
| 4 | 26 | Raya PRODANOVA | 12 | Co Leeds | 1:45.00 |
| 5 | 25 | Zachary EDGE | 9 | Co Manch Aq | 1:47.08 |
| 6 | 23 | Mia THOMSON | 10 | Co Leeds | 1:48.70 |
| 7 | 21 | Taya WINGFIELD | 11 | Co Leeds | 1:50.00 |
| 8 | 19 | Robson HART | 9 | Co Leeds | 1:50.00 |
| 9 | 17 | Olivia BYRNE | 10 | Bo Barnsley | 1:50.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 28 | Noah DARNELL | 11 | Co Leeds | 1:44.20 |
| 1 | 30 | Isla CALLARD | 12 | York City | 1:43.57 |
| 2 | 32 | Joshua MCMILLAN | 11 | Co Leeds | 1:42.20 |
| 3 | 34 | Viktoria ANTONOV | 11 | York City | 1:40.00 |
| 4 | 37 | Rory KING | 12 | Co Leeds | 1:38.20 |
| 5 | 35 | Ruby KEMP | 9 | Co Leeds | 1:40.00 |
| 6 | 33 | Martha FIRTH | 12 | Bo Kirklees | 1:40.21 |
| 7 | 31 | Elizabeth BOND | 10 | Co Leeds | 1:42.70 |
| 8 | 29 | Daisy GLOVER | 11 | Co Leeds | 1:43.70 |
| 9 | 27 | Nicholas CASS | 12 | Bo Kirklees | 1:44.88 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 39 | Ava BRADLEY | 12 | Co Leeds | 1:37.20 |
| 1 | 41 | Evie-Rose TOPPING | 11 | Co Leeds | 1:35.50 |
| 2 | 43 | Poppy GILBERT | 9 | Co Leeds | 1:35.10 |
| 3 | 45 | Alexander YATES | 12 | York City | 1:32.70 |
| 4 | 47 | Patrick O'HARA | 12 | Co Leeds | 1:31.00 |
| 5 | 46 | Callum FOZARD | 11 | Co Leeds | 1:32.00 |
| 6 | 44 | Daisy BRANNEN | 12 | Co Leeds | 1:33.40 |
| 7 | 42 | Ellie AKHTAR | 12 | Co Leeds | 1:35.20 |
| 8 | 40 | Leo LI | 10 | Co Leeds | 1:35.60 |
| 9 | 38 | Freya ELLIS | 10 | Co Leeds | 1:37.70 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 49 | Owen TEMPEST | 10 | Co Leeds | 1:29.20 |
| 1 | 51 | Sebastian HUNTER | 12 | Co Leeds | 1:28.80 |
| 2 | 53 | Amy CHOULARTON | 11 | Co Manch Aq | 1:28.45 |
| 3 | 55 | Ella JORDAN | 12 | Co Leeds | 1:27.50 |
| 4 | 57 | Connor MCCULLEN | 12 | Co Leeds | 1:26.70 |
| 5 | 56 | Annabel GALBRAITH | 11 | Co Leeds | 1:27.00 |
| 6 | 54 | Reuben HARRISON | 12 | Co Leeds | 1:28.10 |
| 7 | 52 | India WILSON | 11 | York City | 1:28.56 |
| 8 | 50 | Samantha TAYLOR | 11 | York City | 1:29.17 |
| 9 | 48 | Eloise ANDREASEN | 12 | Co Leeds | 1:29.90 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 59 | Oliver BARRETT | 11 | Co Leeds | 1:26.00 |
| 1 | 61 | Isabelle KING | 12 | Co Leeds | 1:25.40 |
| 2 | 63 | Reggie SPENCE | 12 | Co Leeds | 1:24.80 |
| 3 | 65 | Shae BRYANT | 11 | Co Leeds | 1:23.60 |
| 4 | 67 | Abigail JAMES | 12 | York City | 1:22.10 |
| 5 | 66 | Poppy PEARSON | 12 | Bo Barnsley | 1:23.02 |
| 6 | 64 | Matei STOICESCU | 12 | Co Leeds | 1:24.80 |
| 7 | 62 | Isabelle HUSSEY | 12 | Wetherby | 1:25.00 |
| 8 | 60 | Hayden LAM | 12 | Co Leeds | 1:25.50 |
| 9 | 58 | Oscar O'DONNELL | 10 | Co Leeds | 1:26.50 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 69 | Scarlett FAGAN | 12 | Co Manch Aq | 1:21.46 |
| 1 | 71 | Jacob O'DONNELL | 12 | Co Leeds | 1:19.80 |
| 2 | 73 | Florence DIXON | 11 | Co Leeds | 1:18.80 |
| 3 | 75 | Mia TRAVIS-JONES | 12 | Co Leeds | 1:14.80 |
| 4 | 77 | William DALE-WOOD | 12 | Thirsk WH | 1:11.10 |
| 5 | 76 | Eve PARKIN | 12 | York City | 1:14.56 |
| 6 | 74 | Elizabeth WARNER | 11 | Co Leeds | 1:16.94 |
| 7 | 72 | Jessica WOODS | 12 | Spenborough | 1:19.13 |
| 8 | 70 | Poppy NUTTMAN | 12 | Spenborough | 1:20.34 |
| 9 | 68 | Emily MARRISON | 12 | Co Leeds | 1:21.70 |