A marked-up statement is not a claim. A claim is a number the payor cannot wave away, and that takes a schedule.

You have worked the patterns and the statement is covered in red ink. That is raw material, not a claim. The deliverable that recovers money is a findings schedule: a structured table where every exception has a contractual basis, a quantified amount, and the evidence that proves it. The difference is decisive. "This looks wrong" invites a shrug. "Clause 8.2 sets 18%, the statement applied 16%, here is the re-performance, the gap is £28,000" invites a cheque. The schedule is the engagement's product, build it to be read by a hostile finance director, because it will be.