During the financial crisis precipitated by the War of the Spanish Succession, the Chetwynd brothers drew on their commercial credit to provide General James Stanhope with the funds he needed to pay the British troops in Spain.
[2] Chetwynd was returned unopposed with his brother Walter as Member of Parliament for Stafford at the 1715 general election and was appointed to office as a junior Lord of the Admiralty in 1717.
Both brothers were defeated in a contest at Stafford in 1722 but he also stood for Parliament on the Navy interest at Plymouth and was returned there in 1722.
Having voted with his friend Viscount Bolingbroke he lost his post at the Admiralty in 1727 and was not put forward for Plymouth again at the 1727 general election.
He was elected MP for Stafford in 1734 in place of his brother Walter and was returned unopposed in 1741.