In March 1755 Simpson applied to Newcastle to be made King’s advocate: he had always exerted himself ‘to promote his Majesty’s interest in the university and other places’, and was the senior practising advocate. But George Hay was appointed. When in May 1756 Hay was dismissed, Simpson again applied to Newcastle, and obtained the post, only to be replaced by Hay in November on the formation of the Pitt-Devonshire Government.
Simpson continued to adhere to Newcastle after the Duke’s resignation; voted against the peace preliminaries, 9 and 10 Dec. 1762; and against the Grenville Administration over Wilkes, 15 Nov. 1763. On 18 Feb. 1764, after the great debate on general warrants, he wrote to Newcastle:
It gives Sir Edward much pleasure that he was able to stay at the House and bear his testimony in favour of liberty. It would have given him more joy had the majority been on his side ... Had he not been confined to his bed all Tuesday [14 Feb] he would most certainly have attended.
Newcastle, in his list of 10 May 1764, classed Simpson as a ‘sure friend’. He died 20 May 1764.
