I had the foresight to get fully comp insurance when I took a car with these creeps last year. I returned it and a guy who couldn't speak English very well told me that the tiny ding in the left side door would cost me £85. When I replied "I'm fully comp and don't even THINK about asking for the keys back until you've signed this off" his attitude radically changed. Basically if you don't get fully comp they will shaft you for the most inconsequential "damage". Guy in front of me was charged £250 for a slight blemish on a hub cap. Avoid at all costs, there are much better rental companies out there.