What do you mean by multi car insurance? Is that insurance to drive mulitple cars, or insurance to cover several cars that you own? Most insurance policies cover the main driver to drive any car with the owners permission, and you can get open drive on your own insurance that will cover any driver with a full licence between the ages of 25 and 70. If you are insuring more than one car, there is usually a discount for the second car, I thought? It may be worth contacting a broker if your case is complicated.