Holburne owed his advancement in the navy to Lord Morton, an intimate family friend, and to Archibald, Duke of Argyll, who ‘took him by the hand in his younger days and made him a captain’.
In 1755 Holburne, considered by Newcastle ‘a very good man’,
I believe you never heard of this Admiral Holburne before ... He is a Scot, you know I don’t think well of that nation for upper leather, nor was he ever thought much of in our service; he is rich and has contrived to insinuate himself into the good graces of Lord Anson, made an admiral and sent here to my assistance. You see by this I don’t like him, nor ever did, having known him from my first entering into the service ... As soon as he joined me, [he] was laying schemes for making a job immediately. I cut him short and told him I sent him to Halifax to fill his water, and join me here as soon as possible. I don’t expect to see him again very soon, but I shall soon be after him.
For most of 1756 Holburne served with his squadron off Brest, and in December was appointed a member of the court martial which tried Byng; strongly attached through Morton to Newcastle and Hardwicke, he took no part in the moves to mitigate the sentence, though he signed the court’s original recommendation to mercy. When, on 2 Mar. 1757, the members of the tribunal were examined before the House of Lords, ‘all the court martial seemed terrified ... except old Admiral Holburne, who cursed and swore at the bar of that House, because Byng was not shot out of the way, without giving him the trouble of coming from Portsmouth’.
Shortly after Holburne’s return in December he was appointed port admiral at Portsmouth, and never held a sea command again. While he apparently lost favour with Anson, who considered him a mischief maker,
Holburne immediately began his campaign in the burghs against Robert Haldane but, hampered by his duties at Portsmouth, besought Loudoun to make interest for him with Lord Cathcart.
Although his appeal was rejected, 11 Feb. 1761, Holburne was returned in April against Alexander Wedderburn, who had replaced Haldane as candidate. Deprived by Argyll’s death of a powerful friend, he now sought the patronage of Bute
Lord Bute was in very good humour ... He complained but very modestly that the Duke of Devonshire and I were against him in the only two elections where he concerned himself ... that it would have a very unpleasant appearance if we two and he should differ; and for that reason he had made up the first, Admiral Holburne’s, and that Holburne was to continue this Parliament.
As a result Wedderburn’s petition was withdrawn. Although Newcastle and his friends ‘rejoiced that Holburne sits this Parliament’,
Permit me to mention my desire of continuing in this command, it having been intended so, as I have been confined here most of the war very contrary to my inclinations, having frequently requested to serve at sea, but here have I been confined, fitting most of the navy for younger officers to go and command them and make fortunes in. I hope your Lordship will think of continuing me.
His request was granted, and he remained a supporter of the Grenville Administration.
Listed ‘pro’ by Rockingham in July 1765, he retained his Portsmouth appointment, but voted against the repeal of the Stamp Act, 22 Feb. During the Chatham Administration he was listed by Rockingham as attached to Bute, and by Townshend and Newcastle as pro Administration; he voted with Government on the land tax, 27 Feb. 1767. Having lost or relinquished his Portsmouth post, he unsuccessfully tried, through Sandwich, to obtain an appointment at Trinity House in July 1767.
In 1768 he stood for Plymouth on the Admiralty interest. A friend wrote to Lord Barrington, 16 Jan. 1768:
We were almost unanimous for your Lordship and Admiral Holburne ... My friend, the Admiral, would at least have had some witticisms on him if he had not been named with your Lordship, such is the advantage of good company.
In the new Parliament he supported Grafton on Wilkes and the Middlesex election. He was made a lord of the Admiralty in the North Administration, holding office until appointed governor of Greenwich Hospital in January 1771. Ten years a Member, he is not known to have spoken in the House.
He died 15 July 1771, remembered for protecting his seamen from brutality, but otherwise having a reputation ‘variously represented by his friends and enemies’.
