This church was largely rebuilt, starting in 1503, in the Perpendicular style by John Wastell, a master mason who also worked on King's College, Cambridge. Further alterations to the building were undertaken in the 18th and 19th centuries, notably a new chancel and a hammerbeam roof by George Gilbert Scott. When the Diocese of St Edmundsbury and Ipswich was created in 1914, St James's Church was made the cathedral. In 1959 Benjamin Britten wrote the "Fanfare for St Edmundsbury" for a "Pageant of Magna Carta" held in the cathedral grounds.