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– patterns for checking which area codes and prefixes are valid and patterns for formatting each number type, archived in 2014 "The first 25 years of UK STD code changes summarised" (PDF). Sam Hallas. May 2014. – detailed information and explanation "Area codes as they were in the early 1990s".
This is the format used by most areas. It has a four-digit area code (after the initial zero) and a six digit subscriber number, and is known as 4+6 format. These area codes were changed by adding a "1" directly after the initial zero as a part of PhONEday in 1995. Just short of 581 areas use this format, and the area codes range from 01200 to ...
The postcode area is the largest geographical unit used and forms the initial characters of the alphanumeric UK postcode. [1] There are currently 121 geographic postcode areas in use in the UK and a further three often combined with these covering the Crown Dependencies of Guernsey, Jersey and Isle of Man.
A group of postcode districts with the same alphabetical prefix is called a postcode area. All, or part, of one or more postcode districts are grouped into post towns. [1] Until 1996, Royal Mail required counties to be included in addresses, except for 110 of the larger post towns.
Postal codes used in the United Kingdom, British Overseas Territories and Crown dependencies are known as postcodes (originally, postal codes). [1] They are alphanumeric and were adopted nationally between 11 October 1959 and 1974, having been devised by the General Post Office (Royal Mail). [2] The system uses alphanumeric codes to designate ...
The remainder of the "mixed" area code allocations and their history are detailed in the table below. Of the 11 area codes freed up for alternative use in the 1980s, only 5 were actually re-used for other services. For example, the 0541 area code was re-allocated to C&WC Area Call services. Six of the area codes remained unused.
The international vehicle registration code for the United Kingdom is UK. [2] Prior to 28 September 2021, it was GB. [3] The specification of plates incorporating the UK code was created by the British Number Plate Manufacturers Association, and is seen as the default design by the Department for Transport. [4]
The 020 area code fully replaced older area codes for London on 22 April 2000, following multiple telephone number changes during the 1990s. [notes 1] As is the case for other codes in the UK, the 020 area code may also be used for services without any physical presence in the area, such as private networks or virtual numbering. [1]