[1][2] He was the eldest son of Boulton Mainwaring of Isleworth, Middlesex and educated at Merchant Taylors' School (1744–52).
He then entered Lincoln's Inn in 1754 to study law and was called to the bar in 1759.
In the 1802 General election, he stood as candidate for Middlesex again was opposed by the radical Francis Burdett.
This article about a member of Parliament representing an English constituency is a stub.
You can help Wikipedia by expanding it.This article about a Member of the Parliament of Great Britain (1707–1800) representing an English constituency is a stub.