[2] At the 1708 British general election Ashburnham stood for Rye where his father had an interest, but was unsuccessful.
After his brother, William, inherited his father's barony of Ashburnham in 1709, he was returned in his place as Tory Member of Parliament for Hastings at a by-election on 10 February 1710.
He gave up his seat in the House of Commons which remained vacant until the 1710 British general election.
He was a Lord of the Bedchamber to Frederick, Prince of Wales from 1728 to 1731 and Captain of the Yeomen of the Guard from 1731 to 1733.
[3] They had one child, John, styled Viscount St Asaph (1724–1812), later 2nd Earl of Ashburnham.