HC Deb 07 June 1957 vol 571 c163W
Captain Kerby

asked the Postmaster-General why the custom of sending out telephone accounts under an On Her Majesty's Service label has been altered by substituting the words "Post Office Telephones" on the envelopes.

Mr. Marples

There has been no recent change, the present practice dating from 1933. The original purpose appears to have been to distinguish telephone accounts from letters sent on behalf of other Government Departments.