| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | A.G. | Club | Time |
| 1 | 2 | Wareham & District SC | Wareham | 3:30.00 | |
| 2 | 4 | Swim Bournemouth | S Bournem'th | 3:01.00 | |
| 3 | 6 | Poole 'A' | Poole | 2:57.79 | |
| 4 | 5 | Weymouth SC | Weymouth | 2:57.82 | |
| 5 | 3 | Poole 'B' | Poole | 3:12.95 | |
| 6 | 1 | West Dorset SC | West Dorset | 3:40.00 | |