Thunder’s career began in the lifetime of his father, after whom he was named. They were both chosen as jurats of Winchelsea in April 1443 by the incoming mayor, Thomas Sylton*, and in the following year, on 13 Apr., Thomas senior, at the start of his seventh mayoralty, confirmed his son’s place on the conciliar body. Six days later the young man was selected to be one of Winchelsea’s delegates to the Brodhull. It was during his father’s eighth mayoralty, and while he himself was still a jurat, that he was returned to the Parliament which met at Westminster on 25 Feb. 1445 and carried on through four sessions until April 1446. Thunder senior confirmed his son’s status as a jurat at Easter 1445 while the Parliament was in progress.
In the course of his career Thunder was chosen as Winchelsea’s delegate to no fewer than 49 meetings of the Brodhull,
Thunder took out a royal pardon, as ‘gentleman alias merchant’ and former mayor on 14 Nov. 1452.
Not infrequently, Thunder was placed in positions of trust. He was a feoffee of the manor of Codyng in the parish of Bexhill, which he received from Godard Pulham* in 1453 and passed on to Thomas Hoo II* and others before April 1455, apparently for the endowment of the Batisford chantry,
In the will Thunder made on 14 Feb. 1474 he asked to be buried next to his father in St. Thomas’s church, Winchelsea, to which he left £20 for the new works as well as a silver-gilt pax worth £5. Every Christmas for the rest of her life his widow Katherine was to distribute 13s. 4d. in alms, and was made responsible for arranging the marriages of their daughters, Alice and Anne, who were each left a dowry of 100 marks. All Thunder’s lands in Sussex and Kent were left to Katherine for her lifetime, and after her death to be divided equally between their daughters, with remainder should the girls die childless to Katherine’s heirs. Thunder specified that Alice was to have the family home in Winchelsea, and Anne another building in the town, but if neither girl left issue these two properties were to be sold to provide prayers for the souls of the testator’s parents and friends. The will was proved on 26 May.
