Smith’s maternal great-grandfather was Sampson Gideon, a wealthy Sephardi Jew and London stockbroker. In an early indication of the strength of his own Protestant convictions, although he obtained a second class degree in classics at Oxford he never graduated because he objected to ‘some portions of the oaths’ involved.
The ministry regarded him as one of their ‘friends’, and he voted with them in the crucial division on the civil list, 15 Nov. 1830. He presented an anti-slavery petition from Pontefract Wesleyans, 5 Nov. 1830, and one from the inhabitants for the declaration of a day of general fasting, 15 Feb. 1831. When Lord John Russell introduced the Grey ministry’s reform bill, 1 Mar., Smith, in his only known speech, was the second Member to respond, professing his anxiety to ‘support the true interests of his country’. After much consideration he had concluded that, given the changing circumstances of the country, there now existed ‘a necessity for some reform’. He was convinced that ‘the influence of the aristocracy is entirely too great in the House’ and that ‘in curtailing it to a considerable extent we deprive them of no right’. He approved ‘in principle’ of the proposed measure, but had reservations about ‘some of the details’, believing that ‘the plan proceeds too much on the principle of population and too little on that of property’; ministers would have ‘done better’ to ‘base it more on the wealth of many towns and districts’. There was also ‘one striking deficiency’ in that the bill made ‘no provision for the more effectual prevention of bribery and corruption’. Having served on an election committee he was granted a month’s leave to attend to private business, 7 Mar., and was therefore absent from the division on the second reading of the reform bill, 22 Mar. However, he voted for Gascoyne’s wrecking amendment, 19 Apr. He quietly retired at the ensuing dissolution. He attended the Hertfordshire county meeting on reform, 5 May 1831, when he reportedly made a ‘milk and water speech’.
Smith subsequently emerged as a prominent Evangelical campaigner and religious philanthropist. He offered again for Pontefract in 1837 as a Liberal, standing on ‘purity’ principles, but was defeated. He unsuccessfully contested Edinburgh in 1846 as an anti-Maynooth candidate, and again failed to win a seat when he stood for the West Riding of Yorkshire in 1848. He founded the Evangelical Alliance in 1846 and was involved in the work of the London Missionary Society; he was particularly interested in improving the condition of the Jews abroad. He harboured a wish to see the Church of England disestablished and its liturgy reformed along more strictly Protestant lines, and expounded his views in several published letters. In 1847, following the death of his cousin, the 9th Lord Saye and Sele, he succeeded to the Belvedere estate of his maternal grandfather Lord Eardley, to which he had been nominated as heir in 1812.
