peace in 1763. He was admitted as a fellow of the Royal Society on 24 May 1764 (and was one of its Visitors to the Royal Observatory, Greenwich, from March 1765), before being one of those the Board of Longitude asked to 'number-crunch' the results of the 1764 second sea-trial to Barbados of John Harrison's longitude watch. From about 1764 he commanded the yacht Mary, later moving to HMY Royal Charlotte, a command he retained until promotion to rear-admiral of the blue on 23 January 1778. He was promoted to rear-admiral of the white on 29 January 1778. Then, in March 1778, he was chosen by his old friend Admiral Keppel (now in command of the Channel Fleet), to be "captain of the fleet" and effectively chief of staff in HMS Victory, which commissioned in May 1778 as Keppel's flagship. (Campbell was Victory's "1st captain", whilst Captain Jonathan Faulknor was her "2nd Captain".) As such, he took an important part in the battle of Ushant on 27 July, was warmly recommended to the king by the first sea lord Lord Sandwich, and remained in the role until the end of 1778. He was promoted to vice-admiral of the blue on 19 March 1779 and to vice-admiral of the white on 26 September 1780. Governorship However, Campbell was offered no further commands until April 1782, when Keppel became Sandwich's successor as first sea lord, and appointed Campbell, governor and commander-in-chief of Newfoundland; Campbell sailed there in (50 guns) on 17 June 1782. On 25 June, the Franco-Spanish combined fleet commanded by Luis de Cordova intercepted Portland, which was escorting another 27 ships. Although the Franco-Spanish fleet captured 19 vessels, Portland and eight merchants managed to slip away. Campbell held the governorship from 1782 to his death in London in 1790. During this time he returned to Britain periodically, allowing him in 1784 and 1785 – at Hans Moritz von Brühl's request – to arrange trials of Thomas Mudge's first chronometer on his passage to and from Britain and in Newfoundland (borrowing an achromatic telescope from the Board of Longitude to ascertain Newfoundland's longitude). Also, as a result of Campbell's proclamation of religious freedom for all inhabitants of Newfoundland, Bishop James Louis O'Donel authorised the construction of a Catholic church. Campbell was promoted to vice-admiral of the white on 24 September 1787. In popular media Actor Andrew Scott was cast as Campbell