EVENT 305 Boys 50m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Ralph NEWTON | 9 | Grantham | |
| 4 | 2 | Freddie HIRST | 9 | Grantham | |
| 5 | 3 | James BACON | 10 | Grantham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 4 | Daniel GODDARD | 8 | Grantham | |
| 3 | 5 | William PENNOCK | 9 | Grantham | 1:13.45 |
| 4 | 6 | Woody CLARK | 9 | Grantham | 1:04.56 |
| 5 | 7 | Benjamin SHEARN | 9 | Grantham | 1:03.48 |
| 6 | 9 | Austin CHEN-REES | 10 | Grantham | 1:01.00 |
| 7 | 10 | Benjamin GODDARD | 10 | Grantham | 59.19 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Derrin BROCKLEBANK | 9 | Grantham | 56.41 |
| 2 | 12 | M PARAPIJONAVICIUS | 10 | Grantham | 56.33 |
| 3 | 13 | Barnaby DURANT | 10 | Grantham | 55.30 |
| 4 | 14 | Thomas KINNEAR | 13 | Grantham | 55.05 |
| 5 | 15 | Thomas HILLSON | 10 | Grantham | 53.91 |
| 6 | 16 | Oscar CHEN REES | 11 | Grantham | 53.01 |
| 7 | 17 | Elliot GLEAVE | 10 | Grantham | 52.52 |
| 8 | 18 | Joshua KIM | 11 | Grantham | 51.21 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | George LEONARD | 11 | Grantham | 50.75 |
| 2 | 20 | A BREARLEY-NEWSOME | 12 | Grantham | 50.41 |
| 3 | 21 | Leo BARNETT | 11 | Grantham | 48.69 |
| 4 | 22 | Henry DOLAN | 10 | Grantham | 48.19 |
| 5 | 23 | Ben CARLYLE | 13 | Grantham | 47.59 |
| 6 | 24 | Alfie HAIGH | 14 | Grantham | 45.64 |
| 7 | 25 | Samuel NICHOLS | 11 | Grantham | 43.85 |
| 8 | 26 | Joel SADLER | 12 | Grantham | 43.36 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 28 | Luke DAYBELL | 14 | Grantham | 38.86 |
| 2 | 30 | Daniel DEGNAN | 15 | Grantham | 35.56 |
| 3 | 32 | Joshua CLARKE | 15 | Grantham | 33.59 |
| 4 | 34 | Jack ZERAVICA | 15 | Grantham | 33.18 |
| 5 | 33 | Zach HOPKINSON | 14 | Grantham | 33.53 |
| 6 | 31 | Jacob FISH | 14 | Grantham | 35.54 |
| 7 | 29 | James NICHOLS | 14 | Grantham | 36.57 |
| 8 | 27 | Oscar DURANT | 12 | Grantham | 42.20 |