well you see it all depends on what is likely to fail on the MOT. Assuming it was only the brakes and exhaust, it should top out at about £200.
But if it fails on other things, then it could be quite costly...
Personally, if I had a car and that was all that was wrong with it and I wanted to sell it, I would have the problems fixed and get it MOTed for the Sale
as I would make more money from the Sale
. Therefore I would be slightly suspicious over the possibility of other MOT failiure points.