How To Write An England Mailing Address . Address letter as you would in the receiving country with country name at the bottom. Introduction—the first paragraph should offer a short explanation of why you’re writing the letter. How to address your mail Royal Mail Group Ltd from www.royalmail.com If posted from the uk you don’t write uk on it, and if posted from abroad you do. You can write to her majesty at the following address: Mr black) dear sir/madam (if you don’t know.