Ouch! That's pretty much the same amount of rain (4 inches in old money) that fell over a weekend in Sept 1968 that caused the floods in the Medway valley back then. OK, so the Leigh Flood Storage Barrier has been built since, but still...
In addition to the places mentioned by DEW, Uckfield is also highly flood-prone since the bypass was built downstream of the town with insufficient space for floodwater to flow under it, and an industrial estate was built upstream of it thus increasing the speed of run-off.
(Edit: post written before seeing the one from 'sunny coast')
Originally Posted by: AJ*