Postal codes used in the United Kingdom, British Overseas Territories and Crown dependencies are known as postcodes. They are alphanumeric.
Street name signs on Birdbrook Road, Great Barr, Birmingham, showing old "Birmingham 22" postal district (top) and modern "B44" postcode.
Royal Mail
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Royal Mail Group Limited, trading as Royal Mail, is a British postal service and courier company. It is owned by International Distribution Services. It operates the brands Royal Mail and Parcelforce
Postcodes in the United Kingdom
…number. This was extended to other cities by 1934. The current system (building on the earlier postal districts) was devised by the General Post Office (Royal Mail) and was adopted nationally in stages between 1959 and 1974. The system was designed with a single objective, to aid (the now) Royal Mail in mechanised…
The Louth-London Royal Mail, by Charles Cooper Henderson, 1820
Edinburgh and London Royal Mail, by Jacques-Laurent Agasse
Lower Edmonton Royal Mail sorting office, in London
Pillar box dating from the reign of Queen Victoria