Was it a total of 104 or 106?
100 customer cars
2 prototypes - exactly as Rich stated a 4.4 version and a 4.8. The factory kept the 4.4 and sold off the 4.8 (Rich's car). Subsequently, the 4.4 was written off and a replacement was built so that MMC still had an Aeromax for their collection and museum. This is the car Charles drives and has chassis 000 - I have been told this car will never be sold by MMC.
The late David's car was a direct replacement for his written off Max but because the VIN couldn't be reused was given a VIN above the 100 number. I do have a note of it somewhere and the owner is on this site.
There have been other RHD/LHD Aeromaxs written off and not rebuilt, so the number will now be below the 100 mark.