Copied from another post of mine,
24 with 6 years ncb, both cars on drive!
I used to have just the z insured with them (admiral) for 10,000 miles a year and cost me £1,500.
I now have the same z insured with them on a multicar policy with 5k miles for £520 and my new pug 107 with 20,000 miles for £213
So a total of over double the miles and it's less than half the price for two cars?