Cooke served as a Staff Officer during the Peninsular War between 1809 and 1812, being promoted from Captain to Lieutenant-Colonel in the Coldstream Guards. He acted as Assistant Adjutant General to Sir Charles Stewart. After being aide-de-camp to the Duke of York from 1814 until 1827, he became his private secretary.
Cooke represented Orford in Parliament between 1826 and 1832 and was described as the ugliest man in the British army.
8th United Kingdom Parliament. 9th United Kingdom Parliament. 10th United Kingdom Parliament.