As far as I know it had it's first appearance, as has been said afore when Shabnam had her job interview there. Ever since it's appeared when Peter was getting his herbal sedatives (or as others thought laxatives) and when Shirley was in with Stan getting his prescriptions. I like how they have a set that they haven't put any real obvious hype behind if that's the word and makes sense? Basically where there was no announcement that a new chemist was opening in Walford like they might have done in the past. It's just sort of slotted in there