In 1790 Rice obtained the county seat unopposed by renewing his family’s alliance with John George Philipps of Cwmgwili: his father had represented Carmarthenshire on the same terms with the concurrence of Philipps’s father.
Rice is not recorded as having voted against ministers in Parliament, where he made no known speech. He was listed among opponents of repeal of the Test Act in Scotland in 1791. He was subsequently a friend to Pitt’s government
