Probably best of all was 'The Sign of Four', in the Shakespeare Street area.
A very odd shop that seemed to sell everything from records to novelties and jokes and quite possibly had 'contacts' for all kinds of other purchases.
They sold Sue and Red Bird label stuff, obscure folk stuff on Transatlantic and mostly, massive amounts of Blue Beat/Ska/Rock Steady/ Ska etc.
I bought the Bert Jansch 'Needle of Death' E.P. there, as well as Winston Francis 'Too Experienced' on the Punch label. Mullardman