In March 1718, Byng, aged 18, was granted a pension of £600 p.a. on the Irish establishment for 31 years with effect from the previous December, ‘in consideration of the long and faithful services of his father’.1Cal. Treas. Bks. xxxii. 264. At a by-election in 1721, caused by his father’s elevation to the peerage, he was returned unopposed for Plymouth on the Admiralty interest. In 1724 he succeeded his father as treasurer of the navy. In 1727, Lord Torrington having settled the Southill estate on him on his marriage,2PCC 25 Potter. he was returned for his county, which he continued to represent as a government supporter until he succeeded to the peerage in 1733.
He died 23 Jan. 1747.