Lee:
I had a look at the gun on WR when you first posted the link, but it doesn't ring any loud bells with me. The cross-bolt kinda rules-out WR, Wilkes, Webley, and a stack of other makers, who tended to use their own distinctive rib-extensions, although with Brit double guns, the rules are "there are no rules"!

Its probably stating the obvious, but even WW Greener shouldn't be discounted, though I've always assumed they usually put their own name on their wares. That bolstering at the breech-end of the barrels is probably going to mean something to someone here. I take it your DR has them too, Lee?

Nice hardware BTW, the epitome of a good solid working double. Bravo!