1783: 23 George 3 c.69: An Act to enable the Adjutant General of his Majesty’s Forces, and the Comptrollers of Army Accounts, to send and receive Letters and Packets free from the Duty of Postage.
[Preamble. Recital of 4 Geo. III. Cap. 24.]
‘WHEREAS by an Act, made in the fourth Year of the Reign of his present Majesty (intituled An Act for preventing Frauds and Abuses in relation to the sending and receiving of Letters, and Packets free from the Duty of Postage), it is enacted, That from and after the first Day of May, one thousand seven hundred and sixty-four, so long as the Revenue arising in the General Letter Office, or Post-Office, or Office of Post-master General, shall continue to be made Part of the Aggregate Fund, no Letters or Packets sent by the Post to or from any Place whatsoever, shall be exempted from paying the Duty of Postage, except such Letters and Packets as are therein particularly excepted: And whereas the Privilege of sending and receiving Letters and Packets, free from the Duty of Postage, is not, by the said Act, extended to the Adjutant General of his Majesty’s Forces for the Time being, nor to the Comptrollers of Army Accounts for the Time being, who, by virtue of their respective Offices, necessarily send and receive many Letters and Packets relating to the publick Concerns of these Kingdoms;’ May it therefore please your Majesty that it may be enacted; and be it enacted by the King’s most Excellent Majesty, by and with the Advice and Consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the Authority of the same,
[Adjutant General, and Comptrollers of Army Accounts, may send and receive Letters free from Postage.]
That, from and after the passing of this Act, the said Adjutant General of his Majesty’s Forces for the Time being, and the Comptrollers of Army Accounts for the Time being, shall and may send and receive Letters and Packets free from the Duty of Postage, in the same Manner, and under such Restrictions, as other Officers mentioned in the said Act are thereby permitted, in respect of their Offices, to send and receive the same in pursuance of the said Act.
Source: Ruffhead, Statutes at Large, Vol. 14.