Those with the lowest ratings will be the cheapest to insure, while those rated in the top 50 band will be the most costly. Car insurance groups are set by the Group Rating Panel, which includes members of the Association of British Insurers and Lloyd's Market Association. The panel is administered by Thatcham Research, which assigns a rating to all new models.

In working out each rating, Thatcham takes into account a number of areas: how susceptible the car is to accident damage, as well as how much it is likely to cost to repair and how long that work may take; the new price of the car; and which safety and security features are fitted.

The cost of cover also varies for people of different ages and professions. So to make all our quotes comparable, GoCompare based each quote on a 40-year-old man from London who has 10 years' no claims bonus and no driving convictions or accidents within the past five years, driving 10,000 miles a year.

Below we count down the 20 most expensive new cars to insure and tell you how much they cost in terms of the annual premium: