"car insurance groups explained" - A new insurance group system has just been released that is requested to be more accurate premiums.1.20 The above groupings have settled and replaced by a rating system of 1 to 50 - although in most cases the premiums will remain more or less at par.Thatcham, the motor insurance repair research is behind the new groups and explains that the 10-20 age bands that were too narrow to reflect the true cost of repair...