The son of a Suffolk landowner with considerable estates (over 9,000 acres) in South Carolina and Georgia, Middleton made an advantageous marriage and aspired to Parliament.
Middleton gave a silent support to Addington, who sealed his loyalty by making him a baronet on going out of office. He was listed an Addingtonian in May and September 1804, voting against Pitt’s additional force bill in June 1804 and for its repeal on 6 Mar. 1805. Like his chief he rebelled against Pitt on Melville’s conduct and was in the opposition majorities of 8 Apr. and 12 June 1805. On 22 Apr. he informed Sidmouth that in reply to Pitt’s circular for attendance on the 25th he had written: ‘It is always my wish to support government, as far as my duty to my country will permit, and more especially, as long as Lord Sidmouth is in his Majesty’s councils, of whom I have the highest opinion’. After Sidmouth’s resignation Middleton wrote:
I assure you I was amongst those of your friends that did not imagine that you and [Pitt] would act long in consort with each other. Your constitutional, economical and temperate mode of conducting the affairs of the country made the machine of the state go on smoothly and quietly ..., whereas the present lavish, jobbing, imperious system forces on the same machine and racks and jars it so much that the consequences must be dreaded.
Sidmouth mss, Middleton to Sidmouth, 22 Apr. [July 1805]; cf. Pellew, Sidmouth, ii. 376.
Middleton supported the Grenville ministry, in which Sidmouth was included. He voted for the repeal of Pitt’s Additional Force Act, 30 Apr. 1806. He hoped to obtain official support at Ipswich at the next election. It was denied him because he could not command support sufficient to carry both Members, which government wished to do. They offered him a Treasury seat in compensation for his withdrawal. He was duly returned for Hastings and gave up a suggestion that he should offer for his county, at least for the present. He begged to be excused attendance in January 1807, because of his preoccupations in the country.
Left without a seat in 1807, Middleton was placed in a stronger position in 1811 by the death of his younger brother, who won £20,000 in the state lottery in 1801 and had £50,000 in the 3 per cents in 1807. He was an avowed Friend of Constitutional Reform at that time, and in 1811, at the county nomination meeting, tried to procure a pledge of support for parliamentary reform from Sir William Rowley.
