A friend of mine found an interesting CD-Rom at a local boot fair which consisted of several hundred photos of old postcards - mostly Kent plus some of Sussex.
Not many mills, unfortunately, but I rather liked the attached one which I think is probably High Salvingrton. Different angle from the one shown in the Hemming’s book.
Not high definition but quite good, nevertheless.
If someone could perhaps positively identify it for me I will be pleased to pass the information on.