Until the mid 60s High Street pharmacies did not sell contraceptives. They had to be bought either from the barber (in a plain brown envelope) or from a "Surgical Appliance" shop. These were usually located in dingy back streets. I know that there was one on High Bridge, and also, I believe, on Pink Lane. The generic name for such shops was Dirty Dick's, no doubt after the original owner of the first one.