In 1765 Cooper was making about £1,000 a year from his successful practice at the bar,
My hand trembles whilst it lays before your Lordship the humble remonstrance of a heart anxious to do its duty and to perform its engagements of honour to your Lordship ... [a friend] has stated my present most critical situation to me in a light which my eagerness to be connected with your Lordship and my ardent and disinterested love of the good cause which you conduct and support prevented me from seeing with my own eyes ... Yet perhaps I could have had firmness enough to have resisted [these] attacks. But—the sight of my wife and children whose happiness, whose welfare, and even provision in the world depend upon my ultimate and final determination in this most important moment of my life, forces me with great reluctance, and after a severe and anxious conflict in my breast, to tell your Lordship, that the duty which I owe to myself and to my family will not permit me to enter upon the office which your Lordship destines for me before the security which has been promised to me in case of a removal be actually in my hands.
On this condition he gave assurances of ‘constant zeal and unalterable fidelity’ to the King and to Rockingham. In October he took up the appointment, and a grant of an annuity to him of £500 p.a. duly passed the Great Seal.
Sir Charles Saunders, Admiral Keppel, and Sir William Meredith have been sitting three days in this city, as a board, to do any Admiralty favour that could procure a vote, as well as canvass for Mr. Cooper ... My lord president of the council has been here also.
Once in the situation which he had accepted after much show of ‘timidity’ and ‘feminine apprehensions of danger’,
Cooper lost his place at the Treasury on the fall of the North Government. In November 1782 Shelburne hoped for his support,
Cooper’s interest in public life was not yet ended. The excesses of the French Revolution led him to abandon opposition. Early in 1793, as soon as Alexander Wedderburn, Lord Loughborough, had been appointed lord chancellor, he offered his services to the Government through him, and told Portland, his nominal political chief, that had he been in the Commons he would have voted with Burke and Windham in support of the Government.
Cooper died 30 July 1801.
