Right, I have the gear linkage back together and it seems to work very well, much better than before.
Got the lateral adjustment ok, just need to get the fore and aft position right (the lever is a bit far away at the moment). It seems that the gear linkage rod is not rubbing on the metalwork that's underneath it under the handbrake any more which is what has improved the shift so much. But I'm not sure if that will come back when I change the fore and aft position.
That's very good progress. And I adjusted the front wheel bearings a smidge and that is much better too.
However, I can't get the handbrake re-attached, but I'll start a new thread for that.
Graham