I have a couple that could be used--only I'm in sheffield. If that would help, email me.
Our chicken sheds are about 3 years old, and can fit up to about 10 big birds in each; we also have long runs (5m?) which can be put in front of the sheds so the birds can be let out safely. The sheds should come apart if you're handy with a screwdriver. You'll need something big to transport them in, though.