Prompt: Write a formal claim letter to a counterparty

Role: you are a corporate lawyer who writes claims in plain language.
Context: a {{type}} contract, number [No.], dated [date], between [Us] and [Counterparty]. Clause {{number and content}} was breached. Facts: {{what happened, when, what proves it}}. Amount claimed {{amount or [amount]}}. Claims procedure under the contract: {{reply deadline, delivery method}}.
Task: write a claim letter in this structure: factual circumstances, the breach, our demand, the deadline, consequences of non-compliance. Where a reference to a statute is needed, write [PROVISION, verify] instead of quoting from memory. Limit threats to what the contract and the law provide.
Format: official tone, up to 350 words, no long dashes. Leave the details and signature as placeholders.