The Consumer Direct website has some useful sample complaint letters covering a range of needs including:

• Faulty goods
• Poor service and faulty goods – for example double-glazing or fitted kitchen.
• Faulty goods bought on credit
• Poor services bought on credit
• Faulty goods bought on Hire Purchase
• Final letter to trader prior to court action. 
  

The templates can be downloaded from the Consumer Direct website through the link on the right.