EVENT 207 Mens Open 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 2 | William PESTELL | 16 | Colchester | 1:12.19 |
| 3 | 4 | B DITCHFIELD-WATKINS | 16 | Leighton Buz | 1:12.06 |
| 4 | 6 | Samuel RENNIE | 15 | Braintree | 1:11.60 |
| 5 | 5 | Alfie FRANCIS | 14 | Colchester | 1:11.73 |
| 6 | 3 | Goscha GOROVOJ | 17 | St Felix Sch | 1:12.10 |
| 7 | 1 | Conor FERGUSON | 18 | C Beds SS | 1:12.21 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 8 | Samuel SKUSE | 18 | Beccles Town | 1:11.32 |
| 2 | 10 | Nathan SWIFT | 18 | Putteridge | 1:11.14 |
| 3 | 12 | Yuto WATANABE | 15 | Hatfield | 1:10.90 |
| 4 | 14 | Marcus KEMP | 18 | Watford SC | 1:10.68 |
| 5 | 13 | Sam MEAD | 17 | Linslade | 1:10.86 |
| 6 | 11 | Owen WEBSTER | 16 | St Felix Sch | 1:11.03 |
| 7 | 9 | William HANDLEY | 17 | Stowmarket | 1:11.26 |
| 8 | 7 | Jacob STEPHEN | 14 | Brentwood | 1:11.55 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 16 | D THURSTON-WOOLNOUGH | 18 | Beccles Town | 1:10.59 |
| 2 | 18 | Michael JUDD | 21 | Dunstable | 1:10.53 |
| 3 | 20 | Matthew ROTHWELL | 17 | Co Peterboro | 1:10.04 |
| 4 | 22 | James NOBLE | 17 | Norwich Swan | 1:09.79 |
| 5 | 21 | J J WILDE | 15 | Team Luton | 1:09.81 |
| 6 | 19 | Matthew DEBENHAM | 15 | teamipswich | 1:10.43 |
| 7 | 17 | Kyle HOLMES | 20 | Hemel Hemp | 1:10.58 |
| 8 | 15 | Mattias MORSE | 16 | Hemel Hemp | 1:10.60 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 24 | Matthew MCLAUGHLIN | 26 | DunmowAtlant | 1:09.57 |
| 2 | 26 | Lewis CHAPMAN | 18 | Stowmarket | 1:09.17 |
| 3 | 28 | Nicholas BOTHA | 17 | Bishop Stort | 1:08.95 |
| 4 | 30 | Dominic MCCARTHY | 17 | Hoddesdon | 1:08.70 |
| 5 | 29 | Harrison JARVIS | 15 | Thurrock | 1:08.80 |
| 6 | 27 | William WHITLEY | 18 | Putteridge | 1:09.05 |
| 7 | 25 | Thomas BOYT | 20 | Felixstowe | 1:09.44 |
| 8 | 23 | Daniel MILLAR | 19 | Co St Albans | 1:09.58 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 34 | Jack MANSFIELD | 17 | Harlow Pen | 1:08.33 |
| 2 | 40 | Joseph COLDWELL | 17 | Watford SC | 1:07.50 |
| 3 | 46 | Lewis SHAYLER | 16 | Watford SC | 1:05.60 |
| 4 | 52 | Nathan HUGHES | 19 | Hatfield | 1:02.82 |
| 5 | 49 | William LOVEMAN | 19 | Co St Albans | 1:04.00 |
| 6 | 43 | Benjamin GREEN | 15 | Watford SC | 1:06.50 |
| 7 | 37 | Finn JEFFERY | 16 | St Felix Sch | 1:08.15 |
| 8 | 31 | Rhys DAVIDSON | 15 | Team Luton | 1:08.60 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 35 | Callum HAROLD | 17 | Bishop Stort | 1:08.30 |
| 2 | 41 | Ayotobi LAGUDA | 17 | Hatfield | 1:07.27 |
| 3 | 47 | Olivier VEDRENNE | 14 | Co Norwich | 1:05.30 |
| 4 | 53 | Lewis WATERS | 20 | Co Cambridge | 1:02.60 |
| 5 | 50 | Samuel PECK | 19 | Co Cambridge | 1:03.83 |
| 6 | 44 | Oliver CASHIN | 17 | Co Cambridge | 1:06.36 |
| 7 | 38 | Thomas HAMILTON | 18 | Royston | 1:08.08 |
| 8 | 32 | Charles RENNIE | 18 | Braintree | 1:08.59 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 36 | Thomas GRIEVE | 19 | Co Cambridge | 1:08.29 |
| 2 | 42 | Jack RICHES | 18 | Co Norwich | 1:07.20 |
| 3 | 48 | Bryn COUSER | 17 | Bishop Stort | 1:04.70 |
| 4 | 54 | Lawrence PALMER | 27 | Putteridge | 58.68 |
| 5 | 51 | Robert LANCASTER | 22 | teamipswich | 1:03.30 |
| 6 | 45 | Freddie LAWS | 16 | West Norfolk | 1:06.20 |
| 7 | 39 | Alexander FLORANCE | 19 | West Norfolk | 1:07.89 |
| 8 | 33 | Mal STAFF | 17 | Co Norwich | 1:08.40 |