In 1773 Percy, ‘being of a delicate and feeble constitution ... by order of his physicians visited the south of France’.
Percy was an Administration supporter; his only recorded votes were with Administration in three divisions on economical reform, February-March 1780, while his only reported speech in the Commons was to present the Northumberland petition, 6 Apr. 1780.
He died 21 Oct. 1830.
