II think the shop was attached to the James rod building factory and outlet for his rods. I use to travel over 40 miles on buses and trains to pick up rods and have a chat in that shop, it was a bit of a meeting place.
Thank you for this very useful information. I was sent a copy of B James & Son Price list after purchasing one of my MK1V rods. I have 6 altogether now. The list gives detail's about all their rods size etc. names and use of each rod