Just had my insurance renewed with Admiral, as a part of a multi car policy. 20 years old, 3 years NCB on a 172 Cup. £780 fully comp. I was very happy with that renewal as it's the lowest I've ever paid. So I would recommend at least calling them for a quote if you have two or more cars in your household.
Here is the example of what I've paid over the years (approx), I have had a couple of other cars too though.
17 Pug 106 1.1 - £1150 (0NCB)
17 Pug 106 1.1 - £930 (1NCB)
18 Pug 106 1.1 - £790 (2NCB)
19 Seat Arosa 1.4 Sport - £900 (2NCB)
20 Renault Clio 172 Cup - £780 (3NCB)
Anyway I'm not here to discuss "how much xxx" as that is a bottomless put of despair (everyone lives in different parts of the country in different situations), I'm mainly posting due to a funny exclusion on the policy that I hadn't seen before -
"You will not be covered for any liabilities you may have for any of the following: use on the Nurburgring Nordschleife" haha, I just find it funny that this is is listed as a specific exclusion.