To answer any questions about getting them made, the sculptor is Dave Clark (
http://www.daveclarkdesigns.com/). I had the piece commissioned through Page&Cooper, at a somewhat higher cost than what Dave charges. But I didn't know him then. Anyway, I thought the price I paid was fair. The price he's charging direct are ridiculously cheap (In my opinion). Anyway, he says to let you know that he can make many different cars (if you're looking for something unique) and often does. He's now listing the GT as part of his 'products', available for 200quid painted, and 140 pounds in natural satin.
So if you're interested, go ahead and contact him. And check out his website for anything different that you may want to commission him to do. Here's a couple of pics, including the McLaren that he did for the 12C launch.