I bought a ST Fiesta and couldn't justify running two cars any more.
On the bright side the little three pot is as much fun to drive as my MG ever was. The car is just perfect for blasting down the B roads, plenty of power and a LSD to pull you round the bends.
The main thing I miss is the meetings with other MG owners and dropping the roof.
Not sure how official it is but there is an extensive section on here.
https://www.the-t-bar.com/forum/21-david-aiketgate-s-guides/152-tyres-sizes-pressures-how-to-find-recommended