As you can see froim Astrid's photo, Frank Hessy's store looks different from the film clip from 'Ferry Cross the Mersey.' There is a scene, supposedly in Hessy's, where you can see Jim Gretty holding the kids back. It doesn't look like the store I remember. Also, Hessy's at the time was in Stanley Street, a narrow street opposite the post office depot, not the large street with all that traffic seen through the window. Most of Ferry Cross The Mersey was filmed in a studio in London, with various location shots in Liverpool.
Bob Hobbs did work at Rushworths and wrote a regular guitar column for Mersey Beat with Hu Birch. They both ran a guitar school and were members of a guitar club.