Do your homework big fella. Get a good look at his accounts, make sure he's not running away from a business that he can't get to work. Has the shop been open since he put it up for sale, or did he just shutter it? If it's been closed for any length of time, you'll have to re-establish a customer base.
And keep in mind:
Not even close to tempting!!
Street is a total backwater, traffic flows all round there but that spot is deader than a dead thing, plus its 50 yards from Sandy Gilchrists old shop which will take any local trade as its been there forever
On the plus side, Gazz in marketing is still ready:
Having said all that, I'm all for turning what you love doing in your freetime into a wage to live off, just make sure that you go into it with both eyes open and that you have a chance of making it work.