Thanks guys, removed the spindle, oil poured out so I guess it was over filled, replaced the O rings, drained and put in fresh oil, and all was good.
Took it to show my old man, who had one from new and banged on about it ever since, and what inspired me to get one forty years later, 80 mile round trip, utterly fantastic and totally faultless.
Now got to clean it and take the final drive to bits to replace all the seals.