I have done a 100 miles since repositioning the gear cables with no reoccurrence of the problem so I think this one is solved.
I have felt the car was not really producing the power I had hoped for since the rebuild, for the first time yesterday, there was an audible air leak, it still went pretty well though. Back home, I found this: The turbo pipe was just resting there.
Another jubilee clip and road test, now I have power and boost up to 0.85 smoothly without over boost.
Off to Iceland tonight for a few days, then Belgium for a month but when I get back it is time for a visit to the rolling road.
One downer, I tried to adjust the suspension but could not move any of the adjusters, to be fair, that was with the wheels still on so that needs a bit of looking at, it is a little too firm for the roads around Lincolnshire.
This rebuild has been a long process with quite a few ups and downs but ultimately worth it. Still some little things to do (there always will be) but I would say to everyone, keep at it! Even when you feel like pushing it off a cliff or torching it, a blast along a windy B road with the top down is the ultimate reward and has a way of banishing the tourette's outbreaks, the scars and back pain from assuming the Lotus position for too long.