As somebody pointed out the other day, part of the problem (not on the A766, I hasten to point out!) is building on flood plains and concreting over large areas, including gardens.
The point being that two days of steady rain which (I understand) was what most of the UK had should be manageable, as opposed to the 50mm in an hour stuff which nobody can cope with.
Here we have also just had two days of steady rain (which has done wonders for my pond!) which has not caused this problem. The river is in spate through the next village but with more than enough ground up-stream of it to flood, that is what it has done so no problems there. Off the fields the ditches are running full but since they are thoroughly cleaned out by law every year, there are no problems there either.
I don't know what caused the A766 to subside but I'd lay a pound to a penny that inadequately maintained drainage channels played a part.
But much easier to blame "freak weather" or"global warming" or "government cuts" than address the underlying problem, eh?