During the seven years’ war Lindsay served at Louisbourg and Quebec and, for his gallantry at Havana in 1762, was knighted on his return home. On the death of his grand-uncle David Scott in December 1766, he was brought in for Aberdeen Burghs as a stop-gap, through Mansfield’s influence. He made no figure in the House, if indeed he attended; and no speech or vote is recorded. He did not seek re-election in 1768.
In 1769 he was sent out to Madras as naval commodore and minister plenipotentiary to treat with native rulers. By his autocratic behaviour and intrigues he incurred the hostility of the East India Company who in 1771 obtained his recall.
