I thought you were referring to the Elan suspension (Doughnuts are in the drive train and not part the suspension). I got my Elan (I still have it) in the 60s and had two acquaintances with Spitfires, one of whom manage to flip his first car over on two occassions (on the same bend on the same road!) and then flipped his replacement car, but in a different place!
Ian P