Maybe a long shot but worth a try - we eae in a dispute with a national loft conversion company called Econoloft, and there seems to be a largish group of people affected. They are now liquidating, but have behaved irresponsibly and we suspect have not followed the rules.
We are trying to find anybody else who is affected in an effort to bring them to account. If you or someone you know is mid project or has recently completed a conversion with Econoloft, please look up Econoloft Scam on Facebook and share your story.
Feel free to PM me if you have any questions.