John inherited a partnership in the bank, shares in the British East India Company, the Sarsden and Churchill estates in Oxfordshire, and £300,000[1] (equivalent to £39.1 million in 2025[2]).
[1] At the 1784 election he was returned after a contest as a Member of Parliament (MP) for Sudbury, an open borough with a reputation for venality where the government backed his candidacy.
The Earl of Egmont had funded his son Viscount Perceval to contest the seat, but Langston and Poulett's brother Vere won by a comfortable margin.
[6] Langston bought some building land in Alcombe, within the borough, from a Quaker William Davis who had advertised for a wealthy challenger.
[1] Luttrell rallied his support by the next election in 1802, and defeated Langston, whose illegal treating of voters after the arrival of the writ, had not been enough to win.