Well no gaurantee’s, but Ive been leaving my car at the quarries and Churchmans etc, on and off over quite a few years. I always leave my windows down to (a) indicate there is nothing of value and (b) avoid them being smashed. I spose someone could nick my car with the windows left down, but (a) if they wanted to nick it then they would smash the windows if I left them up and still nick it. and (b) its a piece of old crap and slow as all heck. Who would want to nick it anyway?