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a) Yes NJS BB shell is British standard, so you could use 24mm cranks.
b) You can't tweak the chainline at the crank, so you'd need to choose the inner (~41mm) or outer (~46mm) chainring position and deal with that.
~1mm (the inner ring position) shouldn't give you any problems, especially with a bushless chain.
The outer ring position will need the wheel respaced and redished to suit.
Scilly.Suffolk
@MechaMorgan
Bought an NJS track frame, 120 spaced at the back.
A) presumably this is British threaded? Presumably I can stick a modern, 24mm axle crankset through 'er?
B) GXP Road Double. What must I do to get a workable chainline? Is it even possible to get a workable chainline?