This is a final 'letter of claim' (also known as a 'letter before action'), demanding payment for an overdue invoice(s). In this letter you threaten court action if you don't get a response.
The letter calculates the total outstanding debt, including, in some cases, any interest due on the overdue amounts.
Use this document only if you have sent one or more invoices to a person or organisation for goods supplied or services performed in the UK.
Ideally you will have sent at least one previous letter of demand. It cannot be used if they have disputed your claim for payment.
This letter is suitable for use where the goods were delivered or services were performed within the UK.