Thank you, the door seals appear in good order, after applying chalk they seem to be sealing all round. The battery compartment is dry, the drain below the battery is also clear. The only solution I can think of now is to take up the carpet clear up all the excess water and get inside the car while someone hoses it down from outside to see from which direction the water comes in hopefully giving a clue as to where it is getting in.
Any other ideas most welcome