no one seams to know - but traditionally MG started body numbers (commission numbers) at 251 for production cars so if this was the case you have a very early ZS ( 251 was the original Abbingdon factiry phone number )
Whats the last 6 digits of your VIN - thing is the vins will have run through from the 45 range so they wouldnt have started the ZS at 000001
Whats the last 6 digits of your VIN - thing is the vins will have run through from the 45 range so they wouldnt have started the ZS at 000001