I know Jessops are crap these days, unless you want a compact digital camera or inkjet stuff. My nearest branch is Huddersfield, where there are 2 branches of Jessops about literally 2 mins away from each other. (2 Sainsburys with a similar distance). One of these brancher (Jessops!) has a good range of film in, in 120 and 35mm. They would have what you want or as near as dammit. Anybody remember the huge white sheet of a price list, with tiny writing they (Jessops) did? - and the range of stuff they sold.