On 18 December 1544 Wroth was returned to parliament as one of the knights of the shire for Middlesex, and in the following year, reputedly through Thomas Cranmer's influence, was appointed Gentleman-Usher of the Privy Chamber to Prince Edward. He served in that office during Edward VI's reign, being dubbed a Knight of the Carpet at the King's coronation on 22 February 1546/7, and was one of the young king's principal favourites. In September 1547 he was sent to the Protector Edward Seymour, 1st Duke of Somerset in Scotland with Edward's letters congratulating him on his victory at the Battle of Pinkie, and in July 1548 was one of the witnesses against Bishop Stephen Gardiner for his sermon in St. Paul's Cathedral. He probably represented Middlesex in the parliament that sat from 1547 to 1552, but the returns are wanting. After Somerset's fall Wroth was on 15 October 1549 appointed one of the four principal gentlemen of the privy chamber, his fidelity to the Earl of Warwick's interests being secured by doubling the ordinary salary of £50. With Lord Rich he was jointly lieutenant of Waltham Forest from 1549. He held the office of King's standard-bearer during the minority of Sir Anthony Browne the younger.