I own a 53 plate XPG MG ZS with the 180 arches etc, its been questioned by others due to the age but lately i have seen an increasing amount of 53 plate MK2s coming up for sale or popping up onto forums/facebook pages.
Heres a link to the most recent one on ebay:
http://www.ebay.co.uk/itm/MG-ZS-180-...item460d1806a4
I do believe that they are all genuine cars as i can't see there being that many people out there doing MK2 conversions due to cost of all the relevant parts etc.