Orphaned in infancy and dependent on scholarships to supplement his limited resources, Best was intended for an ecclesiastical career, but while at Oxford a legacy from a cousin enabled him to follow his natural inclination and study for the bar. As a young barrister on the home circuit he attracted the attention of Lord Kenyon to whose patronage he owed his early professional success.
Best entered Parliament on the Jolliffe interest in 1802. His first known speech, 5 May 1803, was a plea for leniency to the mayor of Grimsby, found guilty of partiality as returning officer. On 10 May he asked for exemption for naval chaplains from penalties for non-residence. In his first major speech, 24 May 1803, he vindicated resumption of hostilities with France, and on 11 Aug. he blamed the rebellion in Ireland on enemy interference, deprecating the discussion of tithe reform and Catholic relief. On 2 Feb. 1804, however, he aligned himself with Fox as teller for the discharge of the Middlesex election petition and on 25 Apr. voted with the combined opposition to Addington. He went on to join opposition to Pitt’s second ministry and, although himself preoccupied in carrying a bill for the relief of the London clergy (introduced on 30 Apr. 1804), he made a point of opposing Pitt’s additional force bill in June and the stamp duties bill in July. He voted with the minorities of 12 Feb. 1805 against war with Spain and of 21 Feb. on defence.
Best was in the majority for the censure of Melville, 8 Apr. 1805, and pressed for action on the tenth report of the commissioners of naval inquiry, supporting Whitbread’s motion for a select committee, 25 Apr. He advocated the criminal prosecution of Melville, 29 Apr., and on 23 May moved for a select committee on the 11th report, with reference to the raising of financial supplies without parliamentary consent. In the event and to his relief he had to postpone indefinitely his resolutions based on the select committee’s report, but was one of the Members deputed to investigate the case against Melville. He was more successful with a bill to regulate privilege of Parliament in the case of bankrupts, which he took to the Lords on 3 July 1805. He had no time for Jeffery’s bid to arraign St. Vincent’s naval administration, 8 Jan. 1806. Between then and the dissolution, his only notable parliamentary action was to obtain leave for a bill to ban newspaper publication of ex parte criminal proceedings, 18 Apr.: he withdrew it in the face of his fellow professionals’ hostility.
Best found no seat in 1806. In 1807 he assisted Edward Berkeley Portman in his Dorset campaign.
His main topic remained legal business. He set his face against Romilly’s attempts at legal reform, 26 Mar., 9 Apr. 1813;
In 1818 he was elected at Guildford, of which he was recorder, on the interest of his distant kinsman Lord Grantley. He vacated his seat before Parliament met on appointment to the bench, which had long been his ambition.
