 He was returned unopposed at Midhurst at the 1722 general election, became a leading ministerial supporter in the House of Commons, and was invited to private dinners with Sir Robert Walpole.He spoke for the Government on the army on 26 October 1722 and recovered his position as one of the Lord Justices (Ireland) who governed Ireland when the Lord Lieutenant of Ireland was absent.In 1723 he returned to Ireland, where he became involved in a lengthy wrangle over a patent for manufacturing £108,000 of copper coinage for Ireland, which had been sold by the Duchess of Kendal, the principal Royal mistress of King George I, to William Wood, a Wolverhampton manufacturer, and which Midleton opposed.