East Sussex. In Wheldon territory. I had a chat with a guy who had one of these vehicles many years back. I have a partial solution by mechanically pushing the gearbox into drive and disconnecting the air actuator. The air system is not working. I'm suspicious of the air supply. There is a combined gauge on the dashboard. As I posted above they are very different readings and the one that I think works for gearchange is only reading 1 1/2 bars. If you can throw any light on what the correct reading should be and why it is low, that would help.