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This class comprises Post Office headquarters files which, as a time saving wartime measure, were recorded under a Decimal Filing system, instead of the previously used 'Minuted' system. Like the minuted series, the files cover a diverse range of subjects and registry staff continued to add files to the series after it had nominally been closed in 1949: consequently, records date up to 1967. Subjects covered in the papers include inland and overseas telecommunications during and after wartime, the issue of stamps, and Post Office administrative records, such as those covering the introduction of the Decimal Filing system.

The Decimal Filing system was a simple system based on numbers being allocated to particular subjects or headings, with decimal extensions of these numbers being allocated to subheadings: e.g. 10 = Postal Packets, 100 = Letters (Ordinary). No record volumes were created for the Decimal Filing series; papers were filed in batches according to the common serial number allocated for a particular subject.

This series has nine sub-series. These cover Telegrams (general), Greetings Telegrams, Forces Telegrams, the Telemessage Service, Overseas Radio and Telecommunications Branch, the Rules and Procedures, material used for exhibitions, Press cuttings and History.

This series consists of a collection of arbitration cases between the Postmaster General and private telegraph companies; memoranda by heads of Post Office departments and their correspondence, records of the Central Telegraph Office, lighthouses and lightvessels, circuits and codes, mobile facilities for telegraphs at race meetings and special events; Letters Patent taken out by inventors and specifications of inventions.

This series consists of a collection of licences, concessions, agreements, treaties, conventions and conferences, correspondence and memoranda between foreign governments negotiating landing rights, maintenance and operation of submarine cable telegraphs; ocean survey reports as well as other reports by officers in the General Post Office and committee reports.

This series encompasses the surviving records of a number of early domestic and international telegraph companies which pioneered the development and growth of the public telegraph network.

This series comprises the records of private telephone companies which were taken over by the Post Office in 1912. It consists of items relating to individual companies, National Telephone Company rules and instructions, staff related records, agreements, judicial proceedings, valuation of assets and a collection of early telephone directories.

Records relating to the operation, policy, development and social impact of the British Post Office from 1636 to the present day. In addition to the provision of postal services, the Post Office's responsibilities have included telecommunications between 1868 and 1981, broadcasting until 1961 and selected banking and financial services. This collection was Designated as an outstanding collection by the MLA in October 2005.