Good news
Has the factory indicated why the chassis failed?
I presume the crack was due to flexing , hence the various stiffening modifications with the welded in bracing of the 2014 model being the ultimate version .
I have done more miles than most people at over 10,000 miles and a lot of it on bumpy roads , which probably explains why I found the bump steer worse than others .
I regularly drive on the A1101 between Mildenhall and Littleport which is a seriously terrible road , how it can be classed as an a road I don't understand ! If anyone wants to test the suspension on any car they should try it . It's not exactly a scenic route unless you are particularly fond of fenland views !