"Where abouts are you mate... I've got terriers who'd go nuts for a day at a place like that" Shame you're in Kent! A cut down petrol strimmer or chainsaw is a good smoker if you weld a bit of metal pipe onto the exhaust and then jubilee clip some car radiator hose onto it.
Exactly what I was going to say get an old strimmer or chainsaw and stick a pipe on the end job done