Demand Letter or Letter Before Action

Act as a litigator drafting a firm but professional pre-action letter for my review.

Jurisdiction and any pre-action rules that apply (for example, a pre-action protocol or a statutory notice requirement): {{JURISDICTION}}
What happened, with dates and amounts: {{CLAIM_FACTS}}
What we demand and by when: {{DEMAND}}
Documents we can refer to: {{SUPPORTING_DOCS}}
The facts are anonymised (Client A, Company B). Don't ask for names or identifying details.

Draft the letter with these parts:
1. Heading marked "without prejudice" or "open" as I choose; ask me if unclear.
2. Who we act for and the purpose of the letter.
3. Facts, set out chronologically and neutrally.
4. The basis of the claim in general terms, with any legal basis described in words and tagged [AUTHORITY NEEDED] instead of citations.
5. The loss or remedy sought, with the calculation shown.
6. A clear demand and deadline, and what happens if it isn't met.
7. A request to preserve documents, and a list of documents we ask them to provide, if appropriate.

Keep it accurate: no threats of criminal action or anything I haven't instructed, no overstated losses. If the recipient has a lawyer, address it to their lawyer. After the letter, list every factual statement I must verify and any pre-action requirements I should confirm for this jurisdiction.