Rumbelows was a white goods store, so didn't sell medicines. I think some of the symbols may refer to duplicate items. I'll give you my guesses using the letter

Rumbelows was a white goods store, so didn't sell medicines. I think some of the symbols may refer to duplicate items. I'll give you my guesses using the letter above to refer to the symbol. The R, U, and L symbols are all from a tape deck, and are play, stop, and pause respectively. The M is a roll of camera film. The B is a frost symbol, and most likely represents fridges / freezers. The E is an on/off symbol; it may just refer to generic electrical equipment, or could possibly represent cookers. I have no idea what the O and W are supposed to be, but if I had to make a stab in the dark I would say one may be microwave ovens and one may be radio or TV. The S is most likely washing machines, as someone else has mentioned.