I can't say I've ever been in that shop, though I passed it twice a day for 16 years, often looking at it from upstairs on the bus while at the stop there. Nor do I remember anything about an accident to the proprietors, but if it happened in 1960 rather than 1950, I wouldn't, because I left in March 1959.
I've done a bit of searching for you - the address is not Ridgeway but 270 Brookvale Road, and I found out the following in the directories to which I have access at home.
1933 - no number, but the Birmingham Co-operative Society ran a confectioner's shop. I guess this might have been a temporary place while the whole area was being built.
1936 - Mrs Catherine Trueman, confectioner
1939, 1943, 1943, 1950 and 1956 - William Nelson, confectioner
1963 - H A Bennett, confectioner
Peter