Very little has been discovered about this MP, and his background remains obscure, although there is a possibility that he was related to a namesake who for several years (at least from 1408 to 1424), had been bailiff of the Sussex rape of Bramber, in which Steyning is situated.
As Bourne was later to be described in the Exchequer records as Thorpe’s ‘servant’, and remained his subordinate there for the next seven years at least, the possibility that the baron had also been influential in securing his election should not be discounted, especially as he was not alone among Thorpe’s close associates to secure a seat for a small or impoverished borough. Furthermore, it should be noted that while the Parliament of 1453 was in progress Bourne was the recipient of payments due to Edmund, duke of Somerset, with whom Thorpe was linked in opposition to the duke of York. The return of this obscure Exchequer official to a Parliament noted for the unusually large presence in the Commons of men loyal to the Lancastrian court must have owed something, if not everything, to his links with the baron and the duke. There is further evidence of an association between them. Later the same year, on 3 Sept., Bourne stood surety at the Exchequer for the duke when the latter was given custody of the lands of a deceased tenant-in-chief; and he acted likewise for Thorpe on four subsequent occasions, in February and July 1456, February 1459 and May 1460.
