Bromley was baptised on 16 December 1685, the oldest son of William Bromley MP, Speaker of the House of Commons, and his first wife Catherine Cloberry, daughter of Sir John Cloberry MP.
He soon became a leading member of the Tory October Club, promoting "Country" policies which the Harley ministry opposed.
This was embarrassing to his father Speaker Bromley, with chief minister Robert Harley complaining to him on several occasions about Clobery's behaviour.
[1] On 19 March 1711 Bromley was elected a Commissioner of Public Accounts, taking fifth place in the ballot.
The House of Commons adjourned until 26 March to permit Speaker Bromley a period of mourning; Jonathan Swift and others believed that the adjournment provided respite for the government, with Harley still absent, recovering from an assassination attempt by Antoine de Guiscard.