[from Smallwoods magazine - see earlier post for details]
"Julian Evans has written about planning in his book Badgers, Beeches and Blisters, summarising his experiences as he's found some variation among planning authorities. 'What you can do in your wood by way of accommodation is camp there or site a caravan for up to 28 days,' he writes. Permitted development also includes a secure tool shed, provided it is sited well away from a highway, but even here one needs to be a little careful. A shed must be a shed - a small hut with no windows and a lot of cobwebs - not something that can double up as a summerhouse or a modest chalet!"