I. First, the Norman choir, of three bays with apse and ambulatory, was pulled down, a broader and longer rectangular choir taking its place. The outer wall of the new choir was built outside that of the old one, so that the latter probably was retained in use for some time, as in Selby choir, while the new works were going on around it. This is borne out by the fact that, contrary to custom, the new work was not commenced at the east, but at the west, for the detail is earlier to the west than to the east. The date 1200 is usually assigned to it. But the entrance arch of the north choir aisle has the Norman diamond pattern; the square alternates with the rounded abacus; the piers are heavy, the arches low, the mouldings large and vigorous, and the foliated capitals at the east end of both aisles are so archaic in character that it seems decidedly to have been commenced in the latter years of the Transitional period, _c._ 1080: it compares with the work at Wells, Chichester Lady chapel, Boxgrove Priory, St. Thomas’, Portsmouth, and Abbey Dore. Of this work only the piers and arches of the three western bays, and the sacristy and treasury, survive. II. Some twenty or thirty years later the south transept was commenced, and a little later the north transept. The builders of the choir had planned it for an aisleless transept. When, therefore, the transepts were built with eastern aisles, the easternmost windows of the choir aisles looked into the transept aisles, and no longer into the open air. As the transepts have no triforium above their aisles, we may conjecture that neither had the choir. III. About the same date as the north transept, a chapter-house and vestibule were built on the north side of the choir, as at Beverley, Lincoln, and York. This had not been contemplated by the builders of the choir; consequently the doorway of the vestibule had to be placed where before was a Lancet window. The vestibule is a bold and vigorous piece of design, with a good vault and a remarkable range of thirteen arcaded seats on its western side. The chapter-house is unique in plan, being an octagon with two long and six short sides: this plan was transplanted to the Lady chapel of Wells. The doorway has bold tooth-ornament; the wall is surrounded by a trefoiled arcade. There is much beautiful glass by Kempe.