The document provides guidance on writing formal letters, including conventions for addresses, dates, greetings, endings, and content. It discusses placing the return address in the top right corner, the inside address on the left below, and flexibility for date placement on right or left. For greetings, it advises "Dear Sir or Madam" if the name is unknown or "Dear [Title] [Surname]" if known, ending with "Yours faithfully" or "Yours sincerely" accordingly. Letters should have an introductory paragraph stating the purpose, middle paragraphs with relevant information, and a closing paragraph specifying expected action.