Sorry to hear of your troubles, got to say I have not purchased anything from ebay of high value, especially not unseen.
I think in our lifetime we all get stuck with vehicles like this, I bought a "mint" RS Turbo once...i spent as much on it as it cost :'(
Moral of the story is cheap is not always best, and I think you would agree with me
Hope you get it through the MOT and hopefully it causes you no futher issues.