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@Scilly.Suffolk
Lovely bike!
Have you checked the mechs move freely without cables?
If so, I can only think of cable friction.
If the cables are new, then barring damage to them on installation, the routing around the headtube is the most likely cause.
Running them into the other downtube cable stop, ie the left-hand/front mech cable into the right-hand stop, would offer a broader curve; but when they crossover at some point lower down might not work.
Try Retrobike: plenty of experience of this sort of set-up over there.