As a youth Pringle went to Madeira, where he made a fortune in the wine trade. When his father died in 1754, leaving his affairs embarrassed, John purchased from his elder brother Andrew the family estate of Haining. On his return from Madeira he divided his time between his Scottish property and his business interests in the firm of Scott and Pringle of Threadneedle Street, London, and, as early as 1762 had some thoughts of entering Parliament.
In Parliament Pringle joined the opposition to the Rockinghams, voting against them in February 1766 on the repeal of the Stamp Act. During the winter of 1766-7 he was listed by Townshend and Newcastle as supporting the Chatham Administration, and by Rockingham as connected with Bute, but he did not vote either on the land tax or on nullum tempus. His correspondence reveals him as a shrewd, independent observer, loosely attached to the Bute party, with a strong aversion to ‘that charlatan’ Chatham.
After North’s fall Pringle became connected with Shelburne, probably through his friend Richard Oswald, and voted for the peace preliminaries, 18 Feb. 1783. He voted on 5 Dec. against Fox’s East India bill, and in January 1784 was counted by Robinson and Dundas as a supporter of Pitt. In 1786 he vacated his seat and was succeeded by his grandnephew Mark Pringle, whom he nominated heir to his great fortune and estates in Britain and Madeira.
He died 27 July 1792.
