Interesting about the brakes....mine are Lockheed like Daves. I wonder if 2009 was the change point for brakes if you have Caparos fitted Peter. My 4/4 had Caparos fitted and I found them pretty poor particularly lacking in feel even with a change of pads to Mintex competition recommended and fitted by Williams. I had been recommended Mogsports "HiSpec" brakes by Mike Duncan but Williams were told by Mogsport that they would not fit behind the current 4/4 narrow wheels.
The brakes are not too bad on my Roadster but may well be something I look at next year.