I saw a thread on another forum recently where the poster had recently acquired a Capri 2.8S and his insurance was £150. Someone asked for details and he posted:
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Liverpool Victoria.
I have a fantastic policy with them.
I have all four cars on one policy, with one renewal and one big dollup of NCB.
At the moment I have this lot covered...
Ferrari 328 GTS
BMW 328 Coupe
capri 2.8 Injection
Mini 1275GT
The total premium is £1,100 and they are all fully comp and unlimited mileage.
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I use Liverpool Victoria myself on both my cars, and they were pretty well the cheapest on my C270, especially bearing mind their 5 star rating. I get a 7.5% discount through CSMA (Civil Service Motoring Association) as my wife qualifies for membership. What Car's cover is also through LV, so it might be worth trying one of their offer codes.
MCE was also mentioned by another poster in the above thread, but I don't anything about them:
http://www.insuremce.com