all the other "issues" would have been standard for the original build
The guy who has written this report is a member of NICEIC. He's right, in the view of any judge, solicitor or most reasonable members of the public; we're just some random anonymous idiots on the 'net.
all the OP needs to do is
No, he would need to find someone more qualified to write a different report. From 200 miles away, tomorrow, and costing less than it takes to just pay this bill.