I was battling with the same option (full or 3rd party) a few weeks back when my insurance policy expired. My dinky toy is valued at about 740K + and the premium comes to almost 30k (ouch) with C******o V*P. But my past experiences forced me to renew it. Burned my Mazda Familia (electrical wonkiness) to the point where it had to be condemned in 2003 and thank God for the full cover, I receovered 90% of the total value of the car from V*P(Shit definetely would have hit the fan if not, coz half the dough was funded by me parents...hehehe).
I really have no faith in the no claim promises they make, its wiser to get a full cover and make sure one claims atleats something withing the course of that year (",).
As for C******o, the've always been faithful to me (always ...always received more than I expected
Have had one bad experience, which was a delay on a horribly rainy day (so guess one can excuse them). As the good experiences i've had with em over rides the horrible ones I've had with them, guess I'd always stick with C******o