This document provides guidance on writing effective enquiry letters. It explains that enquiries can be solicited or unsolicited and for goods or other information. Effective enquiry letters are straightforward, positive in tone, brief and to the point. They include a subject heading, introduction of the request in the first paragraph, details and reason for the enquiry in the second paragraph, and a polite closing in the final paragraph thanking the recipient. The document provides sample enquiry letters and components to consider when drafting an effective enquiry letter.