EVENT 521 Mixed 400m Freestyle Team - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | A.G. | Club | Time |
| 1 | 1 | Daventry Red | | Daventry | |
| 2 | 3 | NSC Gold | | Northampton | |
| 3 | 5 | NSC Green | | Northampton | |
| 4 | 7 | Kettering | | Kettering | 4:21.99 |
| 5 | 6 | Nene Valley SC | | Nene Valley | |
| 6 | 4 | NSC Orange | | Northampton | |
| 7 | 2 | NSC Blue | | Northampton | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | A.G. | Club | Time |
| 1 | 9 | Corby Red | | Corby | 4:05.50 |
| 2 | 11 | Wellingborough SC | | Wellingboro | 3:58.10 |
| 3 | 13 | Corby Yellow | | Corby | 3:51.43 |
| 4 | 15 | Corby Blue | | Corby | 3:45.86 |
| 5 | 14 | Rushden Black | | Rushden | 3:48.01 |
| 6 | 12 | Rushden White | | Rushden | 3:55.12 |
| 7 | 10 | Corby Green | | Corby | 3:58.49 |
| 8 | 8 | Rushden Gold | | Rushden | 4:08.10 |