| Counties | Answer | % Correct |
|---|---|---|
| Gloucestershire, Wiltshire, Oxfordshire, Berkshire, Buckinghamshire, Surrey, London, Kent, Essex. | Thames | 100%
|
| Greater Manchester, Cheshire, Merseyside. | Mersey | 80%
|
| Gloucestershire, Wiltshire, Somerset, Bristol. | Avon | 70%
|
| Powys, Shropshire, Worcestershire, Gloucestershire. | Severn | 69%
|
| Staffordshire, Derbyshire, Leicestershire, Nottinghamshire, Lincolnshire, Yorkshire. | Trent | 68%
|
| Northamptonshire, Cambridgeshire, Lincolnshire, Norfolk. | Nene | 47%
|
| Northamptonshire, Buckinghamshire, Bedfordshire, Cambridgeshire, Norfolk. | Great Ouse | 37%
|
| Dorset, Wiltshire, Somerset. | Stour | 6%
|
| Northumberland, Durham, Tyne and Wear. | Derwent | 4%
|