I use Heritage Specialists (Norton insurance) for Italian cars, managed to half my premium. Under written by Chaucer specialist Insurance. (Chaucer wont deal direct with Joe Public). 0121 246 5050 Tried Adrain Flux but wouldn't insure my car because it was too new?
Try Stuart Eadon at First Point on 01604 499799 - they specialise at higher end, gave me very competitively priced cover on my 4200... they may be able to help