That happened to my brother-in-law over there. He failed MOT and took it to a local shop to have it re-welded. Its cost him about 350 pounds I believe.
I am not sure how adept you are at welding but if you are, then you need to identify the component and weld that caused you to fail MOT and then grind, clean and re-weld the part in question. Afterwards a good coat of primer and paint to keep this from happening again.
Friday, November 16th, 2018 AT 1:01 PM