Thinking more about this, Dealerships are all individual franchise networks which MG sells cars to using the MG brand name. MG is owned by SAIC, which is Chinese state owned.
So in effect, MG is fairly toothless when is comes to dictating expected service levels between dealerships and toothless when it comes to QC at SAIC owned factories. Bit like telling your boss that you will QC all of their work !
Other marques won't have that same challenge I believe, such as Volvo, Renault, BMW ?... Therein is the unfixable problem maybe ?