This article is brought to you by our exclusive subscriber partnership with our sister title USA Today, and has been written by our American colleagues. It does not necessarily reflect the view of ...

There are over 30 million UK postal addresses registered on the Royal Mail's Postal Address File with new locations being added to the database all of the time. When you change address ...

The Royal Mail has explained two letters can never appear next to each other in a UK postcode. The mail service created the postcode system to maintain a database of deliverable addresses.