Ah, but all eastern flowing rivers in England were supposed to have held them at one point, dating back to the end of the last ice age when, what is now the Rhine, ran through the plains that are now under the North Sea.
Now, if it was from the Hampshire Avon you could have a point .
The massive, Great Ouse and Ivel fish. I bet the Wensum has suffered too from otter predation.
A cracker, sir.
I have fished pretty much every river that holds them, south of the Great Ouse for barbel. Wonderful fish.