Earle and his father were among Henry Fox’s chief supporters at Malmesbury, William acting as deputy steward of the borough under him, September 1750-September 1762; it was under Fox’s wing that William Earle made his official career. When urging Newcastle to appoint Earle receiver of the land tax for North Wilts., Fox wrote, 14 May 1761: ‘I would not thus importune your Grace if I were no more than ordinarily desirous to prevail ...’
In January 1765, on a false report of the death of Lord Tylney, Member for Malmesbury, Earle declared himself candidate;
He is often confused with his distant cousin, William Rawlinson Earle.
