[3] Upon his return to England, Beauchamp is believed to have rendered some service to Henry IV prior to his coronation on 23 October 1399, since ten days after that date he received a substantial grant of £40 a year for life, or until he was provided with lands to that value.
The latter was granted in August 1400, when he and his bride assumed ownership for the term of their lives the duchy of Lancaster manors of Easterton and Berwick St. James in Wiltshire.
It is likely that he fought for the king at Shrewsbury in 1403 and campaigned in the north against Richard Scrope, Archbishop of York, and Henry Percy, 1st Earl of Northumberland in 1405.
On his return from France after the Battle of Agincourt he entered Parliament in 1416 as Knight of the Shire for Wiltshire, and on 16 March 1416 was chosen speaker of the House of Commons.
He was employed as counsel by his relative, Richard Beauchamp, earl of Warwick, to argue his claim of precedence before the House of Commons.