Background
Lockhart was the oldest son of Alexander Lockhart, Dean of the Faculty of Advocates.
Lockhart was the oldest son of Alexander Lockhart, Dean of the Faculty of Advocates.
He was educated at Edinburgh University, University of Street Andrews, at Emmanuel College, Cambridge, at the Inner Temple and at Leiden University.
A supporter of the administration of Frederick North, he was an infrequent speaker in debates. Lockhart was defeated at the 1774 general election and an election petition lodged on his behalf was rejected after arriving a day too late.
13th Parliament of Great Britain]
He became a barrister at the English bar, and in 1771 he was elected to the House of Commons of Great Britain at the Member of Parliament (Member of Parliament) for Elgin Burghs.