BOOMER
Bloke from Dorset
Caravan on drive isn't a permanent structure, it's mobile if required to be and as indicated earlier if stripped out with no mains water or sewerage connected it can be referred to as additional storage, could even be a chicken coop for all anyone cares - there's not a lot anybody can do about it if they object, maybe show a little neighbourliness and have some flowers or planters around it, be creative and turn it into a garden feature??