[1] In1727 Bromley was elected in a contest as Whig Member of Parliament for Cambridgeshire with Samuel Shepheard, but was defeated at Cambridge where he also stood.
His first reported speech, said to be ‘well worded’ and ‘studied’ was made on 27 February 1730 in the Dunkirk debate, when he was put up by Walpole to sidetrack an opposition motion.
In 1731, he was one of the Members ordered by the House to draw up a bill for encouraging the sugar colonies, presumably because of his West Indian interests, and this was the basis of the 1733 Molasses Act.
He moved the Address in 1740, and in 1741 warmly opposed the proposal that Walpole should leave the House while the motion for his dismissal was being debated.
After he was raised to the House of Lords he carried on managing the Cambridgeshire elections, and is said to have spent £100,000 out of his own pocket in supporting the government interest in the county and the Cambridge corporation.
In their second innings, Montfort's team had reached 112–4 by eight o'clock when the patrons agreed to "leave off and play it out the next day".
His gambling, in which he was supposed to be ‘the sharpest genius of his time’, also consumed vast sums of money.