I bet the MGA would have preferred proper 5.0/15 bias ply tires that it would have had in 1954. Although it would be possible for a tire manufacturer to make radials that would approximate the same handling. IIRC one could get a rack that fit on the trunk lid, either for a suitcase or for the spare wheel.
I wonder if they did a compression test on the TF, not to mention checking if the inlet manifold gasket was not leaking.