I had the owner of a pub question why i was taking a photo of his pub, I told him that I always take pictures of the pubs I have had a drink in. He said that I haven't had a drink in his pub so I mentioned he wasn't open yet and promised to visit when he was open. Which I did later.
He told me he was worried about spies. (MI5 or MI6 I didn't ask)
Arthurish