This MG is just new-made Rover 75. As is well known, Rover belonged to BMW some years ago. And of course BMW's engineers helped to design Rover 75.
Well BMW had the final say with the designs and they came up with a fair amount of the development funds, but the Rover 75 was mainly a product by financially unshackled Rover engineers, the same people who are now working on Land Rovers, Aston Martins and Jaguars to be precise.
For anyone reading this, I know its old but the ZS is based on the old Rover 400/45 platform. The ZT is the MG based on the Rover 75 which had the help from BMW.