In 1754 Bagot was returned for Staffordshire in place of his father. Classed in Dupplin’s list as a Tory, he was one of the group who frequented the Cocoa Tree, Horn, and St. Alban’s taverns.
In Bute’s list of December 1761 he was classed ‘Tory, Legge’; ‘Legge’ was later changed to ‘Bute’. He did not receive Newcastle’s whip in October 1761. But in November, when a commission of accounts was to be set up, Barrington suggested that he would ‘make a proper commissioner’.
Described by Walpole as ‘Lord North’s particular friend’,
He was a frequent speaker in the House on both national and local issues, voluble, humourless, and a steady opponent of change. Supporting the royal marriage bill, 13 Mar. 1772, he declared that since it was impossible to draw a line defining the prerogative, he ‘as a commoner’ thought it ‘safer to trust that line with the Crown than to trust that line anywhere else’.
By way of proving the fatal tendency of establishing theatres indiscriminately in any kingdom, Sir William adverted to the times of the Romans, when he declared the giving theatres was the cause of the decline of the state; he declared, that to add to the dissipation of the people was always the maxim adopted by those who meant to enslave them ... the Romans were also obliged to establish granaries of corn, and to give the people bread at the same time; this latter he feared would be the next step with Birmingham, if the House gave them a theatre.
Ibid. vii. 136-7.
The Public Ledger wrote about Bagot in 1779: ‘With very moderate abilities, and without any of those engaging qualities which attract men’s regard, has continued to take a lead in the Cocoa Tree club ... He wishes to be thought an unbiassed, independent man, but his conduct in Parliament shows the contrary.’
He did not stand in 1780, having been assured by North that he was to be created a peer. He died 22 Oct. 1798.
