Feilde’s father was a cousin of Thomas Plumer Byde, M.P. for Hertfordshire 1761-8; and his great-grandfather had represented Hertford under Charles II. Feilde was a practising barrister, at least until he succeeded to the family estates, and a London magistrate. He was returned for Hertford in 1770 after a contest, presumably with the support of the corporation and probably also of the Dissenters.
According to his monumental inscription in Stanstead church:
He was an assiduous and able Member of Parliament, actuated by the purest patriotism, attached to no party, until a firm conviction engaged him in an early and strenuous opposition to the American war.
Isaac Barré, reporting to Chatham the debate of 7 Mar. 1771 on Dowdeswell’s jury bill,
Feilde was returned unopposed at the general election of 1774. ‘He approved of the principles of the Declaratory Act’, he said on 6 April 1778,
