Insurance costs UK

I've just received a quote of £390 fully comp on a GTD, does that sound about right?
Age 46, no accidents,claims or convictions, full NCB (on my normal road car)
Please pm me if you are happy to share your cost with me but not everybody.

My policy is with Adrian Flux, 09700 777120 and I paid £219 fully comp last November. Limited Mileage - 3000 miles, and agreed value of £16,000. Higher values will increase the premium, up to a point ( around £30,000) where most companys won't cover for more.

My car has a 3.5 Rover in it at the moment. That may be a reason why my premium seems cheap, and a Ford V8 may attract a higher premium.