Plush probably took his name from the hamlet in the Dorset parish of Buckland Newton, but his origins and paternity are otherwise obscure. Equally, no details of his early career have been discovered. It appears likely that – like other Taunton MPs – he owed his two successive elections for that borough to a connexion with Bishop Waynflete of Winchester, even though only tenuous hints of such a link have been found. Plush’s return for Bridgwater in 1455 may have resulted from his ties with the prominent Somerset lawyer Alexander Hody*, one of the most distinguished parliamentarians of his day, whose service he entered about this time; while Hody himself was probably already acquainted with Waynflete, who within a few months would appoint him deputy constable of his castle at Taunton.
Plush was evidently part of Hody’s inner circle, for alongside his possible parliamentary colleague, Robert Cotys II*, he was among those of the lawyer’s servants towards whom James Luttrell of Dunster (then engaged in a prolonged dispute with Hody and Bishop Waynflete) and his men were explicitly bound to keep the peace in November 1457.
