Then I ran into a huge problem. Handelbar stem and seatpost are the USA only 'chain store' size. Unheard of in Blighty and hence made from unobtainium. I was completely ignorant of that size and didn't know what to do. The project had stalled seemingly indefinitely. Then I coincidentally found some info on Sheldon Brown's site and thus knew what to look for. I got me the parts off ebay USA and this rescued the build.
With brake:
Brake shoes: