@Cycleops : Frame style looks very similar to my MBK Mirage ("internal Crowd-Mo tubing) that I gave to my future son in law.
I missed it; so bought another MBK frame from France (Vitus GTI tubing) which is now waiting for some dry weather for a few rides.
They used several tube types (I have seen them in Reynolds, Columbus and Vitus), and seem to be popular in the rest of Europe - just UK seems a little disinterested.
I have seen them described as MBK = made by Klingons
I think that they have been made in Taiwan since the mid eighties (similar company history to Raleigh I suppose).