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To determine whether a postcode actually exists, you would need to access the Postcode Address File.
(But even that wouldn't be a perfect check, as the PAF is never completely up to date; postcodes are constantly being added, and existing premises are occasionally re-coded.) You can improve the accuracy of the validation by checking the first one or two letters against a lookup table of the 124 postal areas (which can be found at int/post_code/en/countries/GBR.pdf). FUNCTION Check Postcode * Checks that a UK postcode is syntactically valid.
Even if you never need to check UK postcodes, we hope you'll find the technique useful for other tasks.
By Mike Lewis If your database contains UK address data, it's especially important that the postcodes are correctly stored.
However, UK postcodes follow strict formatting rules.
If you don't have access to the PAF, you can at least check that the postcodes in your application follow these rules.
Postcodes in the UK do much more than speed the mail.Thus, SW1A is the outward code for parts of Westminster (SW1A 2AA, for example, is the prime minister's postcode).To summarise, all valid postcodes match one of the following patterns (where A represents a letter, 9 a digit): There are a very few postcodes that don't follow the above rules, but most applications can safely ignore these.The letters represent the 124 UK postal areas (RG, for example, is Reading), while the digits indicate the districts within the areas.Most of the postal areas have two letters, but eight of them are represented by a single letter (e.g. As an exception, a few central London postcodes have an additional letter after the district.
So, in the postcode RG6 1WG (which happens to be that of Microsoft's UK headquarters), RG6 is the outward code and 1WG is the inward code.