Jessops in Glasgow, that right up at the end of Sauchiehall street, had an Aladdin's cave for film photographers in the basement. I've never seen such a large collection of film and chemicals. Last visited this summer, hope it's still in business!

Re your SQA, when buying secondhand film backs be aware that the light seals may be gone. Check with some none critical photography before serious use. If seals are gone a temporary fix is electrician's tape over the dark slide slot. Severely limits the functionality but allows you to take some photos!