Edmund was present at Edward's coronation in Westminster Abbey, and in summer 1277 took fourteen of his knights to join Edward's expedition to Wales. In 1279 Edmund was appointed, along with Thomas de Cantilupe, Bishop of Hereford, and Godfrey de Giffard, Bishop of Worcester, to the regency council formed to govern England when Edward and Eleanor, the Queen consort, travelled to France to take possession of Ponthieu.
Edmund played a role in Edward's coronation ceremony at Westminster Abbey, and later accompanied a group of knights on an expedition to Wales. In 1279 Edmund was chosen, along with Thomas de Cantilupe and Godfrey de Giffard, to serve as part of the governing council for England while Edward and his queen Eleanor traveled to France.