Brett’s father, the eldest son of a yeoman of Kent, was a long-serving jurat of Tenterden, while his uncle Richard settled in New Romney and married the daughter of Robert Thurbarne†, who represented the port in 1586.
In March 1615 the Privy Council recommended that Brett be appointed commander of the Honourable Artillery Company of London, but the City’s aldermen chose another man instead.
Brett maintained his connection with Salisbury, who transferred to him two shares in the Virginia Company.
Brett gave way to Sir Arthur Ingram* at the 1624 election, and even when his supplanter opted to sit for York he failed to find a seat. He does not appear to have stood for the first Caroline Parliament in 1625, which may suggest that he was one of the two captains with the surname Brett who served under Cecil on the Cadiz expedition later that year. In the following year, with his patron, now Viscount Wimbledon, facing a storm of criticism for his passivity before Cadiz, he was elected at Grimsby on the interest of Wimbledon’s son-in-law Christopher Wray*. However, he preferred to serve for New Romney where, presumably with the help of James Thurbarne* and his cousins in the neighbourhood, he had also been elected. He was named to the committee for privileges, and to three committees of military interest. Two were to consider bills to prevent the export of ordnance (14 Feb.) and legalize payments to muster-masters (28 Mar.) while the third was to draft a bill for the finding of arms and horses for the militia (14 March). As a Low Countries soldier he was also interested in the bill to naturalize the children of Sir Jacob Astley (11 May). It is not known whether he had any interest in the bill to void a lease of a Surrey manor made by Merton College, Oxford, to which committee he was appointed on 16 February. His last committee (24 May) was for a private bill on behalf of Wimbledon’s brother, the 2nd earl of Exeter (William Cecil†).
Brett returned to active service for the disastrous expedition to the Ile de Ré, in which either he or Sir Alexander Brett served as sergeant-major of the army.
