I remember when the trains moved to, now what is Moss, in Lower Borough Walls/St James Parade (depending upon the angle of attack). Then it all moved up to the Golden Cot (?) and we were left with The Modeller's Den, now that's long gone. Any retail therapy needs to be carried out in either Midsomer Norton (Signals) or in Frome, at the mighty, mighty Frome Model Centre.
Bath does need a model shop but the extortionate rents mean that's not going to happen any time soon ☹️