| Constituency | Dates |
|---|---|
| Great Marlow | 1768 – 1774 |
| Rye | 20 May 1777 – 1790 |
| Somerset | 1796 – 26 May 1806 |
William Dickinson, despite his mercantile connexions, was not engaged in trade, except that arising from his West Indian plantations, in which he was closely associated with his wife’s family, the Fullers, and with Hans Sloane. He also had an East Indian connexion, and in 1780 supported Paul Benfield’s candidature at Great Marlow.
How Dickinson came to stand for Marlow is not known. In 1768 he was returned after a contest, but in 1774 was defeated. He re-entered Parliament in 1777, succeeding Rose Fuller at Rye, a Treasury borough, where the Fullers had a good deal of influence.
Dickinson consistently supported North’s Administration. His only recorded speech, 2 Feb. 1773, was on a bill concerning the West Indies.2Cavendish’s ‘Debates’, Egerton 242, f. 190. He voted against Shelburne’s peace preliminaries, 18 Feb. 1783, and for Fox’s East India bill, 27 Nov. 1783. John Sinclair wrote of him in early January 1784:3Thurso mss. ‘Voted for the late bill, but could be converted.’ And in Robinson’s list he is classed as ‘very hopeful’—presumably on the basis of Sinclair’s information: which was misleading, for Dickinson went against Pitt, and remained in opposition in the Parliament of 1784. He voted for Pitt’s parliamentary reform proposals of 13 May 1785.
Dickinson died 26 May 1806.
