I was of the impression that in the UK sleeping in the back of your car when drunk could still lead to a charge of "drunk in charge of a vehicle". Could you elaborate on why it's different with a van, please?
UK caravan club got the clarification from the police years ago. The driver cabin is considered separate to the rear. They are two distinct 'rooms'. Unsure when you have a swivelling captain chair, but in my van the seats were fixed.
