I don't think even insurers understand their systems. Before I got the Zed I was quoted about £800, at the same time I was thinking of an XK8 which was coming in at £400. I can understand it being cheaper than the Zed, but not half the price. The XKR was coming in around the same as the Zed for over 100 BHP more.
Now a year on, the Zed with mods is about £750, where as a Ferrari 360, R35 GTR and DB7 are all coming in about the same price at £1100, but a Scooby is £1200