The Hanburys had large estates in Monmouthshire and were proprietors of extensive ironworks at Pontypool. The family had held a county seat since 1720, and John Hanbury’s election on his father’s death was popular and unanimous.
Hanbury doubtless supported the Rockingham ministry of 1782, but his independence was shown when Fox led the former Rockinghams into opposition to the Shelburne Administration. Hanbury voted for that ministry over the peace on 18 Feb. 1783, although John Robinson in the next month reckoned him a follower of Fox. Hanbury, too, was one of the Coalition supporters who voted on 7 May for Pitt’s proposals on parliamentary reform. He was absent during the important session of 1783-4, Robinson carefully noting the reason:
He died at Rouen on 6 Apr. 1784, two days before his fifth unopposed return for Monmouthshire.
