Wow, I didn't expect quite so many replies or that so many would like the colour.
@Old Ned, here's a side view of the shifters. Sorry for the poor photo, they were just at the top of a side view of the frame. They seem to be an additional wide flange washer that sits over the shifter. I'd not seen anything like that before.
Thanks for the Lloyds tip, Robin at MKM-cycles had also recommended them on the website.
The outer plate of the rear mech seems to be made of grey plastic, or something similar.