• if its vintage 40h hub, should build to 27" not onto 700c ;)

    Not necessasarily. I can't find the link but I have read that 700 c and 27" where about at the same time primarily 700 c French (obviously) and 27" primarily British. I also remember reading about something along the lines of raleigh introducing 27" wheels as a proposed 2nd standard. At the time you must remember that the raleigh's Nottingham factory was the largest manufacturing plant in the world and made every part of the bike including the tubes! So if they can introduce a standard which they can supply many other bike companies with it makes sense. 700 c eventually won out and we arrived where we are today.

    As I said I can't find the links I got this from so there may be some errors but I beilve the gist or it to be correct.

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