In 1778 Newcastle opened for his son the family seat at East Retford by transferring William Hanger to Aldborough, and spent lavishly to ensure an unopposed election. Clinton, then at Vienna, wrote to his father, 10 Mar. 1778:
In 1780, Newcastle being ill and Lincoln abroad, it fell to Clinton to present to North the family’s demands—a place for himself and military promotion for his brother—which he did with great self-confidence. ‘You may [be] assured’, he wrote to Newcastle, 5 Nov. 1780, ‘that in my conversation with Lord North I shall talk very openly to him, and at the same time I shall take care of your honour by not behaving as if we meant to make a bargain with them.’
In October 1781 he went to Portugal for his health, and died at Lisbon 10 Nov. 1781. ‘Lord John Clinton has left a will’, wrote George Selwyn to Lord Carlisle, 13 Dec.,
