Hi and welcome from another Kent dweller. I’ve only lived here for 35 years though.
World of Sewing in Tunbridge Wells isn’t too bad for dressmaking fabrics, but better for P&Q, and excellent for machines. C&H used to be good for dressmaking fabrics, but I find it’s main stock is furnishing fabric.
I usually get my fabrics from Rosenberg’s (Stitch fabrics online) either at Hayes Village Hall (Kent)
or go to the warehouse in Wanstead.