Post Office (telephone exchanges). Return giving the names of all telephone exchanges which the Post Office has at any time opened in the United Kingdom, with the date of opening; the number of subscribers at opening; the date on which each exchange had the largest number of subscribers, and their number; the date on which each exchange now without subscribers became so; the number of subscribers on 31st day of December 1896, 1897, and 1898 on exchanges then open; the number of subscribers who have given notice to leave any exchange; and the tariff [electronic resource].