| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | A.G. | Club | Time |
| 1 | 2 | Poole 'B' | Poole | 3:00.93 | |
| 2 | 4 | Weymouth SC | Weymouth | 2:37.75 | |
| 3 | 6 | Swim Bournemouth | S Bournem'th | 2:30.00 | |
| 4 | 5 | Poole 'A' | Poole | 2:30.64 | |
| 5 | 3 | Wareham & District SC | Wareham | 3:00.00 | |
| 6 | 1 | West Dorset SC | West Dorset | 3:10.00 | |