Why not phone one of the specialists and try and get a quote with you as main driver - Adrain Flux, Firebond, Sureterm, Frank Pickles.
Don`t do it over the net and don`t try a comparison website.
If you have other drivers in your family see what adding them as named drivers does to the premium - weirdly it might bring it down
There should be a difference based on value and engine bhp but with the sort of quote that you might be looking at it could well look like rounding.
If you wanted to be creative you could maybe get the cost down with a young driver policy (compulsory tracker, limited miles , no use between 11pm and 5 am for example). Also try a multi-car policy with Admiral if there is another car in the family to insure.