In 1819 Ommanney assumed sole control of the London naval agency founded by his uncle Edward, who had given him a start in life. The following year he stood again for Barnstaple, where he had been successful in a notoriously corrupt contest in 1818, and was returned unopposed. He was known to be ‘friendly’ to Lord Liverpool’s ministry, and he received a knighthood shortly after the election.
He divided against more extensive tax reductions, 11 Feb., and abolition of one of the joint-postmasterships, 13 Mar. 1822. He declared that he would support the ‘repeal of all taxes that peculiarly affected the poor’, 28 Feb., and voted for gradual reduction of the salt duties. However, he voted against their total repeal, 28 June, when he complained that government economies had reduced many civil servants to a state of beggary. He divided against removing Catholic peers’ disabilities, 30 Apr., inquiry into Irish tithes, 19 June, and the motion condemning the lord advocate’s conduct towards the Scottish press, 25 June. He voted against the Calcutta bankers’ claim for recovery of debts from the East India Company, 4 July. He voted for the Canada bill, 18 July, and the aliens bill, 19 July 1822. He divided against parliamentary reform, 20 Feb., 2 June 1823, when he dissented from the Devon petition on the subject. He voted against further tax reductions, 3 Mar., repeal of the duty on houses valued at under £5, 10 Mar.,
He voted against the production of papers regarding Catholic office-holders, 19 Feb. 1824. He welcomed an increase in the navy estimates, 16 Feb., and presented a Barnstaple petition for repeal of the coal duties, 23 Feb.
Ommanney died in November 1840. His son Octavius carried on the naval agency, which in 1862 amalgamated with a firm of bankers and naval agents to become Hallett, Ommanney and Company; it had disappeared by the turn of the century.
