^^^^ Should have told the OP this before the viewing.
I viewed a Mk2, lovely looking car highly polished clean interior etc etc. Advertised far too cheaply to be nothing wrong with it, I was correct.
Before I even asked questions I took a cursory glance at both rear wheel arch/sill areas which did show slight signs of bubbles under the paint. I then asked the owner to pop the bonnet open, first thing I did was reach down and feel under the OS front chassis rail, my hand came back out with a large chunk of rusty metal and other debris from the car. Showed this to the owner and said, your rails are gone, he replied it’s got an MOT so must be ok. I closed the bonnet and said it needs sorting then said bye bye.
Yep these problems can be fixed but who wants that sort of job to have to pay out on top of the purchae price. I really believe the owner of the one I viewed knew about the problem he had with his, I kinda got a feeling about it before I even got there from questions asked beforehand. Still you can come across genuine cars/owners etc sometimes, seek and you shall find.