I am in contact with the man in Scotland and he told me he is in the process of manufacturing a few more units. The problem is it is not a mass production factory and we have to be patient.
I have open my compressor and the measurements and component part numbers agreed back to the AUDI/VW units. Therefore it seems that all the base compressor units are indeed the same thing.
Once he is ready, I will order and arrange shipment to repair my unit (hopefully). I will give you feedback.
.