Newton Wallop, 6th Earl of Portsmouth JP, DL, styled Viscount Lymington until 1891, was a British Liberal politician but then joined the Liberal Unionist Party in 1886. He later switched back to the Liberal Party to serve as Under-Secretary of State for War under Sir Henry Campbell-Bannerman from 1905 to 1908.

Barnstaple was a constituency centred on the town of Barnstaple in Devon, in the South West of England. It returned two Members of Parliament to the House of Commons of the Parliament of the United Kingdom until 1885, thereafter, one.