Frank, wasn't there an upgrade that you could purchase called the 'Centenary Pack' in 2010? I believe this could be fitted to Plus 4s but I may be mistaken.
Helen at Richard Thorne confirmed this to me this morning. They offered the pack for the Roadster and the +4.
It is just a pity that MMC offered the Amazon Green Metalic Paint Colour as well just to confuse with the Limited Edition Roadster 100 which is identical but for the Rear End and Firewall Badges.