Bill I sympathise, both the Sainsburys in my neck of the woods have shut down their film section. I only use them occaisionally when I have had to use the emergency roll of XP2 I always carry.
I have been fortunate to find a guy in Ruislip who will scan in TIFF format and at whatever resolution I ask for, so I am feeding him to stay onside
It may take some hunting/detective work but I hope you find somewhere that comes up to scratch.