Lowther entered the diplomatic service, and was an unpaid
Attaché to the
British embassy in Berlin from 1841 to 1846 and then a paid Attaché at the Berlin Embassy from 1846 to 1852. He was Secretary of the Legation at
Naples from 1852 to 1858, at
St Petersburg from 1858 to 1859 and at Berlin from 1859 to 1861. He was Secretary of the Embassy at Berlin from 1861 to 1867 and finally Minister to
Argentina at
Buenos Aires from 1867 to 1868. After his return from Argentina, Lowther decided to build a new house in London. He bought land in
South Kensington immediately south of
Hyde Park, and there erected
Lowther Lodge, an exemplar of
Queen Anne Style architecture. The cost was partly defrayed by a bequest from his uncle
William Lowther, 2nd Earl of Lonsdale, who died unmarried, and without legitimate issue, in 1872 and was succeeded by Lowther's elder brother,
Henry. In 1873, he was granted the style and precedence of the younger son of an Earl by Royal Warrant. He was then elected MP for
Appleby. He held the seat until 1892 when he was succeeded by
Sir Joseph Savory, Bt. ==Personal life==