Duncan Davidson became a junior partner in the London merchant house of George Chandler (1721–79), which traded in sugar from the Caribbean.
The partnership of Davidson & Graham, operating from Fenchurch Buildings in the City of London, prospered in the sugar trade for over a quarter of a century.
A compromise was reached whereby Davidson would hold the seat for four years before resigning in favour of a candidate to be decided by Brodie's supporters.
However, once in Parliament, Davidson supported the government and Dundas agreed to his retaining the seat until the next general election.
This article about a Member of the Parliament of Great Britain (1707–1800) representing a Scottish constituency is a stub.