Hi there,
I stumbled across this thread, and as I worked at Mushroom Bookshop for a few years in the mid-90's, can add a little bit to it:
Mushroom Bookshop started on Arkwright Street in 1972, set up by the late Keith Leonard and his then partner Chris Cook. Not entirely sure of the order of things, but at some point it moved to Heathcote Street, taking over the site of the Drury Hill Bookshop (which I presume had been on Drury Hill before that whole area was demolished to make way for the Broadmarsh Centre - anybody know?). By the time I first knew it (1990), it took up numbers 10-12 Hea