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The postcode area originated in 1857 as the SE district. In 1868 it gained some of the area of the abolished S district, with the rest going to SW. It was divided into numbered districts in 1917, by giving the district closest to London and the location of the head office the suffix "1" and then each district assigned a number alphabetically based on the location of the main office within the district.[3] SE28 is a much later addition carved out of the existing districts SE2 and SE18 in order to accommodate the development of Thamesmead. Unlike in the SW postcode area, where districts are also split into two alphabetical tranches, SE1 is the only head district, and although the numbering begins again at SE19 this is not a head district.[4] The postcode area is part of the London post town.[2] There are no dependent localities used in the postcode area.[2] SE1P is a non-geographic postcode district for PO boxes located in SE1.[5]
In 2002, a small group of residents in the West Heath area wished to have their postcodes changed from SE2 to the adjacent DA7 postcode district, citing higher insurance for their houses, belongings and cars as reasons to change. Royal Mail has said it will not consider changes to postcodes for these reasons.[7]
SE postcode area map, showing postcode districts in red and post towns in grey text, with links to nearby BR, CR, DA, E, EC, IG, RM, SW and WC postcode areas.