Just to update on this. It was the new metal master cylinder at fault.
Just could not get a full pedal. Fitted a new plastic master cylinder from dmgrs with original plastic pipe, and it bled up no problems and has been fine since.
Interestingly if I disconnected the master and slave, the pedal was firm, but it must have been drawing in air from somewhere. The metal master seemed to be weeping fluid - hard to tell where from but I think it was between the cylinder and reservoir.
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