Ramsay set up as a merchant in London but in 1743 gave up business and returned to Scotland to live with his uncle, Sir Alexander Ramsay, as his heir-presumptive. In 1744 Sir Alexander and his nephew, secretly and by dubious means, secured the agreement of Alexander Irvine of Saphock, an old and ailing man, to the marriage of his daughter, aged ten, to young Ramsay, to whom all the Irvine property was transferred on condition that he adopted the Irvine name. Immediately after the clandestine ceremony, the child was removed from her parents’ home to Sir Alexander’s house, where she remained until shortly before her death in 1750. Irvine having died in 1746, Ramsay thus became possessed of a considerable estate, his right to which was challenged by the Irvine family, whose claims were sustained by the court of session but lost in 1753 on Ramsay’s appeal to the House of Lords.
In 1754, shortly after succeeding to Balmain, Ramsay Irvine stood for Kincardineshire,
From 1766 Robert Rickart Hepburn conducted a successful campaign against his interest in Kincardineshire,
