I've just heard back from one of the local historians who's going to be visiting with some colleagues this evening. Apparently, they've checked their records, and he has
written in his email.....
"Enquiries confirm that this was a store for the Luftwaffe anti-aircraft battery located in the vicinity"
So, where's that anti-aircraft battery I wonder? I'm looking foward to seeing what they have to say when we meet up later.