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 participated in Edward's coronation at Westminster Abbey, and subsequently led a group of knights on an expedition to Wales. In 1279 Edmund was selected, along with Thomas de Cantilupe and Godfrey de Giffard, to be part of the council that would oversee England while Edward and Eleanor traveled to France.