Did they include a free wash with it, or did the car come back in exactly the same condition as you dropped it off? Also work near Gatwick and some of these meet & greet firms operate that way so you don't see their parking facilities - often just a muddy field somewhere. I've heard stories of cars being ragged around fields and then just jetwashed afterwards to hide the evidence. Unfortunately, a Subaru and a field is always going to be tempting for these kind of idiots