Chemist In High Street 1940 50s

A Memory of Slough.

Many many years ago, I can remember large queues outside a "chemist" type shop at the far end of the High Street, especially on a Saturday morning. I believe he sold a patent type product that was supposed to help with ulcers. I think the shop had a couple of steps at the front and was somewhere near Bucks music store. PLEASE, please can anyone remember the name of the shop and the man who ran it?
Many many thanks.