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This class comprises reports, papers and correspondence relating to the establishment, development and operation of Britain's Inland Letter Post service, spanning the period from 1635 to 1989. At present, POST 23 is divided into 14 Sub-Series, containing some pieces originally in POST 22. There is a small amount of material that relates to seventeenth and eighteenth century developments (see Sub-Series 1 'Establishment and Introduction of the Inland Letter Post' and Sub-Series 5 'Introduction of the Penny Postage'). However, the majority of the records held in this class relate to developments that occurred in the nineteenth and twentieth centuries, which was the period in which a great expansion and modernisation of the inland letter service occurred within Britain. For the nineteenth century, there is interesting general information in Sub-Series 2 'Inland Letter Post, General' and, in Sub-Series 3 'Missing Letter Branch Case Papers', there are over 50 files of records created by the Missing Letter Branch, who investigated mail thefts between 1839-1859. The largest group of records within this class for the twentieth century is Sub-Series 8 'Two-Tier Inland Letter Service, Correspondence and Reports' which relates to the substantial changes that occurred from the 1960s that accompanied the introduction of a first class and second class postal service, amongst other changes that further modernised the system. Other than Sub-Series 14 'Seditious, obscene and libellous publications sent through the post' which comprises records for the years 1876-1927, the latter half of this class (Sub-Series 9-13) is filled with reports, business plans and material related to other significant developments that have occurred within Britain's letter post service from the late 1960s to the late 1980s.