I've rented a few over the years. I've got to be honest - its abloody nightmare round here.
I finally found a place last week. Its a single bay, with electricity. £25 a week.
Unless your needing something with extra door/roof height (like i did), your probably better off looking on somewhere like gumtree for garages for rent. There is a posibility that there may be more space availiable where i am now, but you would need to arrange that with the bloke who owns the barns.
Give me a shout for his number if your interested