Sir James Johnstone Bart.

MP for Dumfries Burghs 1784-1790 and Weymouth and Melcombe Regis 1791-1794, brother and heir of Alexander Johnstone and brother of William Johnstone Pulteney (both of whom q.v.). Another brother, John Johnstone, MP for Dysart Burghs 1774-1780, was an East Indian nabob.

1. The will of Sir James Johnstone of Grenada West Indies was proved 21/03/1796. In the will he bequeathed his estates in Scotland and the West Indies to his brother William [Johnstone] Pulteney: the West Indies estates had come to Sir James Johnstone originally under the will of another brother, Alexander Johnstone, whose will had been dated 23/05/1775, according to Sir James Johnstone's own will. Sir James Johnstone was buried at Westminster Abbey 19/09/1794: his brothers William and Alexander were also buried there.

http://www.historyofparliamentonline.org/volume/1754-1790/member/johnstone-sir-james-1726-94 [accessed 27/11/2014]. The entry makes no mention of his slave-ownership but says he 'supported the abolition of the slave-trade' and notes that his frequent interventions in the session of summer 1784 included 'West Indian trade' among other issues.

1. PROB 11/1272/224; Ancestry.com Middlesex, England, Extracted Parish Records [database online]; http://www.westminster-abbey.org/our-history/people/alexander-and-james-johnstone [accessed 26/11/2014].