Went back to KF before they closed.
They put it on the ramp again- called me over to see that a bracket that the exhaust kinda rests on was bent...Don't know how they missed it the first time

...
Said they don't do brackets and I should get one from a main dealer!
So that begs the question- did I really need a new backbox? Kwik Fit says yes, reckon it was rotten but then they would say that wouldn't they?
On the bright side if it really was on it's way out it's now been replaced.
On the crap side I'm £48 lighter and still have an annoying noise coming from the exhaust. Don't have much cash at the moment so, I'm gonna have to put up with it...
Do you think the bent bracket will cause problems with next months MOT?