During his first Parliament Scott had been connected with the Prince of Wales. In March 1754, as an opponent of Argyll, he was considered by Pelham a very doubtful supporter of Administration, and reference to Lady Dalkeith, as representative of the Buccleuch interest, apparently confirmed the view that he would probably be in opposition.
He voted, 2 May 1757, with the Newcastle-Fox group on the Minorca inquiry. During the negotiations of 1757 Newcastle, when exploring the possibility of an Administration which might exclude Argyll, listed Scott, immediately after the lord register, Hume Campbell, among those personally attached to himself. Scott took an active part in the agitation for a Scottish militia, was a member of the committee nominated to prepare the bill, and was thanked by his constituents at the Roxburgh head court, Michaelmas 1760, for his support of the measure.
Returned unopposed in 1761, Scott attached himself to Bute, and in December 1762 was listed by Fox among those favourable to the peace preliminaries. Closely connected with John Pringle of Haining and Sir Gilbert Elliot, whose ‘county politics were a good deal mingled up’ with his,
Scott’s relations with the Marchmont family deteriorated and at the 1780 election he bitterly offended the Earl by encouraging his own son Hugh Scott to oppose Sir John Paterson, Marchmont’s son-in-law, in Berwickshire. As a result Marchmont disinherited Walter Scott’s children.
Scott died 25 Jan. 1793.
