His shop was where MyDentist is now. He sold Akai VHS machines and rented out tapes - remember Jock getting Cannibal Holocaust and I Spit On Your Grave from there, my dad had no idea of the content! He only had the shop for a couple of years before getting sick of it, probably by beginning of '83.
And the Private Shop was where the Caspian is now - had a black front. And it moved to Brook Street later. It's probably a barber's now...