Called ‘junior’, Thomas was sent from Rye to a meeting of the Brodhull at New Romney in April 1436, during the mayoralty of his presumed father and namesake. It was the older man who attended the Brodhull held in the summer of that year, and the two of them were returned together to the Parliament which assembled at Westminster in January 1437. The younger Thomas served as a delegate from Rye at the Brodhull of December 1438,
Long probably made a living by trade, and the customs accounts of the period show him dealing in wine brought into the ports of Sussex.
Initially, Long was prepared to be active in the affairs of Rye. For instance, in February 1462 he accompanied the mayor on a visit to Tenterden, now annexed to Rye as its member-port, and twice in 1464 he was delegated by the Portsmen to represent their interest at Brodhulls. Nevertheless, his payments for the farm of the ‘tower’, owed to the commonalty, fell into arrears,
