Gits, hope this has a happy ending.
This happened to someone I know, car was SORN and left outside a his unit on an industrial estate for a few weeks, one day no car...police did nothing but write something down in their book.
CCTV from another building showed it on the back of a lorry. I'd like to say a low loader and the car to treated with care, but it was a lorry that builders merchants use with a big claw grabber. I recall the car looked in a state on the back of the lorry, car was never found...suspect it was taken to a scrap yard or stripped for parts.