Hutting ( no not posh cottaging)

[grumpy old man]

that's my idea ?
porta cabins and steel containers put around to make a square two high and about 40' long
put a tunnel through under ground to another few under ground and an escape route
as for:
huts in the woods
you can with out planning put small 30 sq mtr wooden huts up with small burners and solor pannels in and for use as weekend breaks or short holidays but you can play around with the rules like the rich do.
also you can put as many as you like
check out lakeland cabins in cumbria