In the United Kingdom, the term postcode lottery refers to the way the allocation of postcodes, which often bears little relation to local government boundaries, can affect such things as insurance prices. The term is also used to refer to the way local budgets and decision-making can lead to different levels of public services in different places especially with regard to health and social services, e.g. access to cancer drugs or quality of education.
Postcodes were devised solely for the purposes of sorting and directing mail and rarely coincide with political boundaries. However, over time they have become a geographical reference in their own right with postcodes and postcode groups becoming synonymous with certain towns and districts. Further to this, the postcode has been used by organisations for other applications including government statistics, marketing, calculation of car and household insurance premiums and credit referencing.
There are several groups, mostly on the fringes of major population centres, who are affected in one way or another by the associations of their postcode. There is a movement in the Royal Borough of Windsor and Maidenhead to change the first two characters of their postcodes from SL to WM for vanity, so as not to be associated with Slough. A businessman in Ilford wishes to have the postcode district of IG1 changed to E19 as he claims customers do not realise his business is based in London.
Residents of West Heath in SE2 wish to have their postcodes changed to that of adjacent Bexleyheath, citing higher insurance premiums as reason to change. Some residents of Kingston Vale in SW15 wish to have their postcodes changed to adjacent Kingston upon Thames for the same reasons. Residents of Denham, Buckinghamshire have postcodes associated with Uxbridge, which causes confusion to delivery drivers.
In all these cases Royal Mail has said that there is "virtually no hope" of changing the postcode, referring to their policy of changing postcodes only to match changes in their operations. Under this policy residents of the Wirral Peninsula had their postcodes changed from the L (Liverpool) to CH (Chester) group when a new sorting office was opened.
Some postcode areas straddle England's borders with Wales and Scotland. Examples of such postcodes include CH4, SY10, NP16 and TD15. This has led to British Sky Broadcasting subscribers receiving the wrong BBC and ITV regions, and newly-licensed radio amateurs being given incorrect call signs.
Postcomm says the following regarding the extended use of postcodes and the Postcode Address File (PAF):
|“||Many organisations – including new postal operators, banks, insurance companies and others offering to deliver goods to your door — have a need for this information. It would be very time-consuming and costly for anyone to try and replicate the list, so Royal Mail licenses PAF data, for a fee, allowing others to use it. ... Although we have a role in ensuring that PAF is managed well, Postcomm does not intervene to resolve disputes involving individual postcodes. A postcode is a routing instruction, allowing a postal operator to sort and deliver mail accurately and efficiently. It is not necessarily a geographically accurate description of where a property is located.||”|
See also 
- Butler, Patrick (2000-11-09). "Q&A: Postcode lottery". The Guardian (London). Retrieved 2010-05-22.
- Devlin, Kate (2008-09-08). "Healthcare postcode lottery means patients losing out on cancer treatments". The Daily Telegraph (London). Retrieved 2010-05-22.
- Garner, Richard (2009-10-19). "Postcode lottery still determines degree achievement". The Independent (London). Retrieved 2010-05-22.
- "England | 'Snobs' want to slough off postcode". BBC News. 2003-01-17. Retrieved 2010-01-04.
- Scrivens, Louise (2005-04-05). "England | London | The power of the postcode". BBC News. Retrieved 2010-01-04.
- "Cracking The Codes Not Easy (from This Is Local London)". Thisislocallondon.co.uk. 2002-03-12. Retrieved 2010-01-04.
- Scrivens, Louise (2005-04-05). "UK | England | London | The power of the postcode". BBC News. Retrieved 2010-01-04.
- "Postman Pat Gets L Of A Row Off His Chest — This Is Wirral". Archive.thisiswirral.co.uk. Retrieved 2010-01-04.
- Postal Services Commission (March 2009). "Royal Mail’s Postcode Address File". Postcomm.