EVENT 304 Men Open 200m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 2 | Charles Simpson | 07 | Plymouth Lea | 2:11.40 |
| 1 | 4 | Hawkan Hall | 06 | Co Milton K | 2:10.98 |
| 2 | 6 | Justin Christie | 06 | Leatherhead | 2:10.66 |
| 3 | 8 | Jack Brown | 07 | Co Bristol | 2:10.33 |
| 4 | 10 | Luke Critchlow | 05 | Stockport Mo | 2:09.76 |
| 5 | 9 | Mikhail Naumovich | 06 | Chesham | 2:10.05 |
| 6 | 7 | Thomas Duddridge | 06 | Millfield | 2:10.36 |
| 7 | 5 | Toby Parker | 06 | Bo Stockton | 2:10.68 |
| 8 | 3 | George Moore | 06 | Co Leicester | 2:11.03 |
| 9 | 1 | Liam Hamp | 06 | Thanet Swim | 2:11.44 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 12 | Samuel Grimes | 06 | Wigan BEST | 2:09.75 |
| 1 | 14 | Louis Thorne | 07 | Co Bristol | 2:09.56 |
| 2 | 16 | Jack Allman | 06 | Wycombe Dist | 2:09.15 |
| 3 | 18 | Jaydon Paul | 04 | Eastbourne | 2:09.02 |
| 4 | 20 | James Robinson | 05 | Co Leeds | 2:08.96 |
| 5 | 19 | Raheel Mahmood | 07 | Romford Town | 2:08.97 |
| 6 | 17 | James McClure | 06 | Co Birm'ham | 2:09.11 |
| 7 | 15 | Max Shaw | 05 | Co Milton K | 2:09.19 |
| 8 | 13 | Max Russell | 06 | Co Sheffield | 2:09.60 |
| 9 | 11 | Lawrence Elliott | 05 | Seagulls SC | 2:09.76 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 22 | Matthew Hamilton | 07 | Plymouth Lea | 2:08.93 |
| 1 | 24 | Samuel Arrowsmith | 03 | Tiverton | 2:08.25 |
| 2 | 26 | Bartek Karpisz | 93 | Co Bristol | 2:07.85 |
| 3 | 28 | Sam Cornish | 04 | Enfield Sq | 2:07.55 |
| 4 | 30 | Ethan Stubbs-Green | 07 | Millfield | 2:07.22 |
| 5 | 29 | Maxwell Adams | 05 | Team Bath AS | 2:07.47 |
| 6 | 27 | Aidan Mitchell | 03 | Solihull | 2:07.60 |
| 7 | 25 | Roman Parham | 05 | Brighton | 2:08.01 |
| 8 | 23 | Davey Unwin | 06 | Stockport Mo | 2:08.79 |
| 9 | 21 | Oliver Shead | 05 | Plymouth Lea | 2:08.94 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 34 | Joshua Harris | 01 | Tadcaster | 2:06.09 |
| 1 | 40 | Harry Jones | 00 | Co Norwich | 2:04.84 |
| 2 | 46 | Charlie Broome | 04 | Co Leeds | 2:03.45 |
| 3 | 52 | Ewan Wilson | 02 | Co Sheffield | 2:01.34 |
| 4 | 58 | Charlie Hutchison | 02 | Loughboro Un | 1:58.29 |
| 5 | 55 | Cole Hewitt | 02 | Co Sheffield | 1:59.79 |
| 6 | 49 | Adam Wilson | 01 | Co Sheffield | 2:02.67 |
| 7 | 43 | Dominic Morgan | 05 | Leatherhead | 2:04.04 |
| 8 | 37 | Benjamin Tritton | 00 | SurreyUni SC | 2:05.77 |
| 9 | 31 | Joshua Weston | 04 | Wycombe Dist | 2:07.22 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 35 | Llewellyn Porter | 08 | Camden Swiss | 2:05.89 |
| 1 | 41 | Rico Bringeman | 05 | South Lincs | 2:04.70 |
| 2 | 47 | Matthew Holland | 98 | Wolv'hampton | 2:03.20 |
| 3 | 53 | Aaron Fox | 01 | Co Sheffield | 2:00.79 |
| 4 | 59 | James Woodward | 00 | Hatfield | 1:57.75 |
| 5 | 56 | R Rowbotham-Keating | 05 | Co Manch Aq | 1:59.54 |
| 6 | 50 | Ned Sharp | 03 | Skipton | 2:02.12 |
| 7 | 44 | Albert Branch | 05 | Sevenoaks | 2:04.03 |
| 8 | 38 | Henry Gray | 06 | Chelsea&West | 2:05.61 |
| 9 | 32 | Samuel Ryan | 06 | Mt Kelly | 2:06.90 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 36 | Edward Marcal Whittles | 06 | Chelsea&West | 2:05.80 |
| 1 | 42 | Patrick Heeks | 03 | Pershore | 2:04.67 |
| 2 | 48 | James Cleaver | 05 | Beckenham | 2:02.87 |
| 3 | 54 | Collyn Gagne | 00 | SFA Canada | 1:59.88 |
| 4 | 60 | Joshua Gammon | 03 | Bath Univ | 1:57.31 |
| 5 | 57 | Antonio Rodriguez | 04 | Swansea Uni | 1:58.71 |
| 6 | 51 | Riccardo Lucarelli | 05 | Mt Kelly | 2:01.38 |
| 7 | 45 | Cyril Hanson Schleiper | 02 | Nova Cent'n | 2:03.56 |
| 8 | 39 | Jake Thomas-Mansfield | 00 | West Suffolk | 2:05.23 |
| 9 | 33 | Ellis Cleworth | 04 | Loughboro Un | 2:06.68 |