Holmesdale, whose father was promoted in the peerage in 1826 for his services as ambassador to China and governor-general of India, was returned on a vacancy for East Grinstead in 1829 on the interest of his half-brother the 6th earl of Plymouth. He sat undisturbed until the borough was disfranchised in 1832, but is not known to have spoken in the Commons. Although he took his seat on 17 Feb. 1829, he gave no recorded votes that session. He divided against the transfer of East Retford’s seats to Birmingham, 11 Feb., Lord Blandford’s reform motion, 18 Feb., and Jewish emancipation, 17 May 1830. That autumn the duke of Wellington’s ministry regarded him as one of their ‘friends’, but he was absent from the crucial civil list division, 15 Nov. 1830. He voted against the second reading of the Grey ministry’s reform bill, 22 Mar., and for Gascoyne’s wrecking amendment, 19 Apr. 1831. At the ensuing general election he acted as chairman of the Ultra Tory Sir Edward Knatchbull’s* election committee in Kent.
He succeeded to his father’s earldom in 1857 but ‘rarely took part’ in Lords debates. He died in March 1886, ‘one of the last survivors of the unreformed ... Parliament’, and was succeeded by his eldest son, William Archer Amherst (1836-1910), Conservative Member for West Kent, 1859-68, and Mid Kent, 1868-80.
