He was appointed a Commissioner for excise in April 1689, but lost the post in October when he was unable to subscribe to a government loan.
He held the post until 1715 and proved an assiduous postmaster, making many improvements, particularly with regard to overseas mail.
He signed the Association in February 1696 and voted with the Court for fixing the price of guineas at 22 shillings in March.
He presented a petition to the House of Commons on 23 February 1699, from the inhabitants and clothiers of Halifax, with regard to woollen manufacture.
He became involved in the attempt of Dumfries Burgh to have their postal service to Carlisle established by Act of Parliament.
At about this time he discovered that a clause in the first Lottery Act made his post as joint postmaster incompatible with a seat in Parliament.
[3] Frankland kept his place as joint postmaster-general until 1715 after the accession of George I, and was appointed as a Commissioner for customs until 1718 when he was too infirm to carry on.