I was with Classic Line whilst I had my (Lagos Blu) Integrale EVO 2. Up to ?100k, you only have to send them half a dozen photos & fill out a form re its condition. Because there's always been plenty of Integrales about, CL were able to quite easily confirm the agreed value I was after (100k). Since our cars are somewhat rarer, it might be an idea to try & source some recent sales so CL can benchmark your car.

Good luck.

Cheers,
Hedge