Thanks Dazmond, save hunting, here it is again: obviously you need to edit to suit

Thursday 31th December 2009
Dear Ms ,
Re: Window Cleaning Services at
Following your original request for window cleaning services at the above address, you accepted our offer of service on a regular six monthly basis at a price of £30 per visit. We cleaned them initially on the 24th of April 2009, for which payment was subsequently received.
Our second visit in accordance with the contract was on the 22nd October and our invoice was submitted to Norman Road as required.
No payment has been received and three telephone requests for payment have been ignored.
We must now insist on full payment within 14 days of the above date. The sum required is the invoice total of £30 plus a late payment additional charge of £10 to cover our costs in chasing this debt.
If we do not receive a cheque in the sum of £40 by Friday the 15th January 2010 we will take one of the following actions:
1. We may apply to the Small Claims Court, this action will incur additional costs, and we have access to expert legal assistance via the Federation of Small Businesses which could involve further costs to be borne by you.
2. We may sell the debt to a professional debt collection agency. This will involve you in considerable extra expense.
Yours sincerely,
Ian Lancaster
Director: Ian Lancaster Window Cleaner Ltd.
www.ianlancaster.co.ukPlease forward a cheque for the full amount of £40.00 made payable to “Ian Lancaster Window Cleaner” to the above address.