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@Tea_Bee
As I happened to be passing, I asked the Evans Cycles shop in Docklands if the could re-face the JIS headset down to ISO, had a debate with the mechanic who insisted there is only 1" and 1 1/8", then was told they could do it, but only if I bring the whole bike from Oxford to them (which means cycling a bike that's too small for me across London) and they will kindly do an entire headset service for me (which I don't need).
Or I could buy the tool to do it but realistically, how many JIS headsets am I ever likely to run into to justify owning the tool for this? Vitually none I reckon. So maybe I'll just leave it.