How to Address an Envelope in the UK: Royal Mail Guidelines
A correctly addressed envelope is the single most important step in ensuring your letter arrives. Royal Mail has clear guidelines on format, postcode placement and return address positioning.
What is the correct format for a UK address on an envelope? The standard format is: recipient name on the first line, house number and street name on the second line, town or city on the third line, county on an optional fourth line, and postcode on the last line. Each element should be on its own line. The postcode should be written in capital letters.