The UB postcode area, also known as the Southall postcode area,[2] is a group of eleven postcode districts in England, within six post towns. These cover parts of western and north-western Greater London, plus a very small part of Buckinghamshire. The letters in the postcodes are the phonemic abbreviation of Uxbridge.
^ abcd"Non Geographic Codes"(PDF). Royal Mail Address Management Unit. July 2012. Archived from the original(PDF) on 16 September 2012. Retrieved 20 December 2012.
^UB18 includes a series of postcodes where, unusually, the last two letters correspond to the ISO country code for various countries in the trading name of the address, such as "Spring France, GREENFORD, UB18 7FR". Royal Mail – Find an address[permanent dead link]