Thank you for the replies. I'm following up. Has anybody had a gearbox from Powertrain Transmissions (Tony)?

Of course getting a box is part of the battle - they need to be willing to box it up and send it to Oz. Ashcroft did it, it worked although I did check to see if the sticky out bits got bent. (Nothing surprises me, I bought a Tillett carbon seat once and I was promised "they" couldn't damage it unless they ran over it with a forklift - guess what?)