Born in Bilbao, Spain, Cargill was the eldest of seventeen children. His father, William Cargill, was a descendant of Donald Cargill, a Scottish Worthy who was martyred in 1680. An army captain, Cargill’s father had served with distinction in India, Spain and France, before emigrating to New Zealand, where he founded the Otago settlement in 1848 and became a member of the colony’s House of Representatives.
In June 1863 Cargill offered for the vacant seat at Berwick-upon-Tweed, following the death of one of the sitting members. Brought forward by the borough’s Conservatives, Cargill’s rivals criticised his lack of local connections, but his support for the abolition of church rates appealed to moderates, and he defeated his Liberal opponent.
An occasional attender who made no known speeches in the Commons, Cargill voted steadfastly with the Conservative opposition on most major issues, including against the county franchise bill, 13 Apr. 1864, the borough franchise bill, 11 May 1864, and the Oxford tests abolition bill, 14 June 1865. A staunch opponent of Palmerston’s foreign policy, he voted for Disraeli’s censure of the ministry’s handling of the Danish war, 8 July 1864.
At the 1865 general election Cargill was again attacked for having ‘thrust himself upon the community of Berwick’, and cut an unpopular figure on the hustings.
