The time/miles the machine was operated before the brace was installed, road conditions where operated, and manner in which it's driven are all significant variables that can only reduce certainty on this subject.
I do find it depressing that as purchaser of a second hand machine, I'm likely looking at a chassis change at some point in the future without any consideration from MMC though this is clearly their issue.
Britsobrits, you have every right to be very concerned.....
It raises a couple of issues:-
1) It leaves you nervous to drive the car.
2) Unsure if you should engage Morgan now as the vehicle is potentially unsafe and not fit for purpose, and
3) Thinking you should cut your losses and sell it knowing it has the potential to kill or injure someone else
Would you give it to your partner, son or daughter to drive ?