This series consists of bound volumes of Tilley's private letters and correspondence to the Postmaster General, the Treasury and various Post Office officials and members of the public during the time in which he was first Assistant Secretary and then later Secretary. In 1854 the Post Office underwent a general revision and the Treasury appointed a Commission of Enquiry upon which Sir Charles Trevelyan, Sir Stafford Northcote and Mr Hoffey sat. Tilley was greatly interested in the work of the Commission and, as a result, much of his private correspondence is from, and to, members of the Commission. A further area in which Tilley had influence of interest was the revision and improvement of the Rural Post System and, as a consequence, the extension of the rural delivery. Again this is reflected in the nature of the correspondence within the volumes.
Furthermore, the correspondence covers a variety of subjects including inland and overseas mail arrangements, Sunday labour disputes, wage disputes, opening of the Post Office Savings Bank, and telegraph business. There is also correspondence relating to his knighthood.
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