Progress
Oil drained, sump off, filter changed, sump back on gearoil added and cycled gearbox three times with the third time the gearbox wanting to move the car. Next time I am back out I will do the final check of the level, one final cycle and then try and move the car.
I take it that the movement of the car is evidence that the gearoil has reached the places that the gear oil needs to reach and that we are not far away from actually getting my car to drive.