[5] Despite qualifying as a barrister, Singleton turned to the British Army, becoming an ensign in the 1st Foot Guards in 1782.
He later served as a major in the Suffolk volunteer cavalry, and a cornet in the Middlesex yeomanry.
After a period as a socialite, Cornwallis's influence secured Singleton's parliamentary seats and his appointment in 1795 as Storekeeper of Ordnance.
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