Dear David

In settling your account for £261.75 may I express my sincere thanks for the period of extended credit which you have allowed and the way in which your staff have been most helpful.

The prompt and highly efficient response to our difficulty was carried out without unnesessary delay and with courteous professional expertise.

I shall not hesitate to recommend your quality company to anyone considering using your products and service.

Again very very sincere thanks. Reg.