I now have 6 cars in my collection with out any C number for them It would be nice if this info could be passed to the right department in hornby and they were to reply on this forum Sets in question are C3589a Mclaren and Brabham C1346 Monaco set Mclaren Mercedes and Mercedes Petronas C1347 World Champion set GP racer Red and GP racer Blue I am sure other people have other cars from other set with no knowledge of there C numbers If so Please add to this Forum.