From 1745 till at least 1768 Gibbons was a member of the Barbados assembly; and apparently retained an active interest in island affairs when settled in England.
In 1761 Gibbons was returned unopposed at Wallingford. He was included in Henry Fox’s list of Members favourable to the peace preliminaries but voted in opposition in the divisions of 1, 9 and 10 Dec. Gibbons was classed in Bute’s list as his follower and on 22 Apr. 1763 asked Bute to recommend him for an Irish peerage, declaring himself ‘already much obliged’.
In 1768 Gibbons was defeated at Wallingford. He did not stand again, and died 9 July 1776.
