Walpole, described by Lady Harriet Leveson Gower as ‘no bigger than my thumb’ after a serious illness in 1810, was launched by his father in the diplomatic line. His father’s brother George Walpole was under-secretary to Fox at the Foreign Office in 1806 and it was to Fox that Lord Orford applied, securing a promise of employment for his son. It was implemented on Thomas Grenville’s recommendation and Walpole was whisked off to St. Petersburg as attaché.1Letters of Countess Granville, 2; NLW mss 2790, Walpole to Williams Wynn, 11 Mar. 1806. After acting in the same capacity at Madrid, he came home and succeeded to his father’s seat for Lynn, which he retained unopposed until he succeeded to the title. On 26 Jan., 23 Feb. and 5 Mar. 1810 he voted with opposition on the Scheldt expedition, which doubtless encouraged them to believe that he was destined to be one of their ‘thick and thin’ supporters. Their error was seen at the time; in December 1810 Walpole, who had appeared in no more minorities, was reported to have deserted opposition on the Regency question2Fortescue mss, Fremantle to Grenville, half past 5 [Mar.]; Lonsdale mss, Long to Lonsdale, 5 Dec. 1810. and on 1 Jan. 1811 he appeared in a government minority on it. His second cousin Thomas Walpole was Spencer Perceval’s brother-in-law. In June 1811 he accepted a place at the Admiralty board and first spoke in defence of a court martial, 18 July. He voted against sinecure reform, 21, 24 Feb., 4 May 1812. On 21 May he spoke and subsequently voted against Stuart Wortley’s motion for a stronger administration, describing it as an unconstitutional attempt to dictate to the crown its choice of ministers.
Walpole opposed Catholic relief, 22 June 1812. At that time he was at loggerheads with his father over his resolution to marry an allegedly illegitimate heiress. While she had ‘no great objection to a little husband and a large title’, his father was ‘bit with the furious mania against the children of nature’ which also inspired the Cavendishes when Henry Frederick Compton Cavendish married the lady’s sister.3Farington, vii. 101; Barnard Letters, 197. Before joining Lord Cathcart’s mission to Russia, Walpole voted against Catholic relief, 24 May 1813, and in favour of Christian missions to India, 22 June 1813. On his return from Russia late in 1815 he did not press for further diplomatic employment: he had for some time wished to be relieved, owing to the expense of St. Petersburg.4Castlereagh Corresp. x. 324, 356; xi. 73. He continued to vote steadily with administration. In 1818 he was placed at the Board of Control, where he remained until shortly before his father’s death in 1822. He died 29 Dec. 1858.