Harbord came of a rich and influential Norfolk family, and in 1756 was returned unopposed for Norwich with the support of his cousin the second Lord Buckinghamshire. ‘It is true indeed my son is very young’, wrote Sir William Harbord to Newcastle, 30 Sept. 1756,
but bred in the same principles with his father who for many years together in Parliament invariably supported the measures of the then Administration, may he have an opportunity of performing the same with regard to the present.
In fact throughout his parliamentary career Harbord followed his own thoroughly independent line. In 1761 Newcastle after some hesitation marked him as doubtful.
Harbord was returned unopposed in 1774. In 1780, though deserted by some of his original supporters, his personal influence was sufficient to return him at the top of the poll with a large majority. The English Chronicle wrote of him shortly afterwards:
In private life he is a kind of rustic despot—rigid to his tenants, tyrannic and lofty to his immediate adherents, and exact to a degree of puerility, in all the game laws; but as a compensation for these defects he is in his public conduct the friend to freedom, and votes invariably on the side of liberty and patriotism.
Harbord voted for Shelburne’s peace preliminaries, 18 Feb. 1783; and for Pitt’s proposals for parliamentary reform, 7 May 1783. He did not vote on Fox’s East India bill, 27 Nov. 1783, but in Robinson’s list of January 1784 was classed as ‘pro’, and henceforth supported Pitt’s Administration.
Less than half a dozen speeches by Harbord, on minor matters, are reported during his thirty years in the House.
He died 4 Feb. 1810.
