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@Dammit
Ok, £18.50 later at lunch time I am now the proud owner of some vernier calipers.
Width of seat tube 33.5
1/2 of above figure 16.75
To chainring midpoint from outside of seat tube 56
Chainline 39.25
Dropout width 8.5
To sprocket midpoint from outside of dropout 26.5
From inside of dropout 18
Width of dropouts 120
Chainline 42
Which gives an overall chainline discrepancy of 2.75mm.
Swapping to a 113mm bottom bracket should push my chainline out by 2.5mm, which should solve this problem.
So that's what I'll do- but the question remains why does this crankset not deliver a decent chainline?
The (very cheap) hub does, the (very expensive) crankset does not.
It make no sense to me.