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@clubman
A small but general point: measuring components made to imperial sizes in metric makes for awkward numbers. I think it's easier to stick to the originals, for example: standard British rear fork end spacing (for single gears or Sturmey) 4.25", chainline 1.5" (sorry about the decimals, the keyboard doesn't do fractions properly!), and I think you will find that the Raleigh's seat pin is 25.4 mm. or, as I would say, 1".