So, the moral to the story is never count your chickens
I suppose one of the good things about shakedown tests is they identify some issues. The last couple of days identified a couple of minor issues. Nothing serious and the sort of things that would probably be ironed out earlier in a production car life rather than in a bespoke one-off.
Yes, it's a bit frustrating and when I got the call today I might (nearly) have shed a tear but I know they want the car to be perfect and since it's going to be their showcase car the additional delay should be fairly insignificant in the long run.
In the meantime, some more photos

Planes, Trains and Automobiles. Wanted: Train.