A couple of years ago I was asked by a group of photographers from Arizona to lead a week long workshop in the UK. They specifically asked to make photographs in English cathedrals so I made enquiries at the major attractions. Generally the fee was in the region of 5 (sterling) but the main problem was that they needed prior notification that I would be going to do photography. It may have been because I was taking with me 4 or 5 photographers. If you wish to know some telephone numbers of specific catherdrals let me know and I'll sort them out for you amd email you direct.
HGet back to me on lesmcl@scotborders.co.uk