Lukeys was off the Market Square and opposite the Town Hall where the Allotment is. As I recall Gaskin's was halfway between Ladywell and the Victoria Hospital site but might also have been where Christine says at some point - I'm sure Terry will be on eventually to put us all right!
Interestingly, the stained glass windows in the Stone Hall are the only examples known to exist of Victorian stained glass depicting a mobile phone, have a close look next time you're in there.