Cheers guys.
I am putting everything in writing to them (letters and emails) addressed to the company director.
I have not spoken with citizens advice yet, I am trying to avoid spending any more time than is necessary dealing with it.
If they are unwilling to contribute or do not get in touch before Thursday then I shall seek legal advice. Finding the time to do that is quite difficult though :-/
Shells, when you had you manifold change, did you have to replace any nuts? or fit a new gasket? I am hoping to take my car to a local mechanic and just want to make sure I have the required parts should he have to cut/grind nuts off etc...