The remains of the abbey church confirm that it survived the fire of 1380, and show that it was built on an impressive scale. It was laid out with an aisled nave, a central transept crossing supporting a tower, and a presbytery to the east with choir aisles serving as chapels both north (Our Lady) and south (St Michael). The proportions are indicated by the high north wall of the north transept containing the arch of a window 45 feet high, while the length of the church is estimated at 165 feet. The choir aisles, not occupying the full breadth of the transepts, opened into them by a single arch to the west and into the presbytery by two arches supported by columns or half-columns of octagonal section. Their separately pitched roofs are shown by gabled offsets on the east walls of the transepts. Their altar-spaces and eastern walls were closed from the presbytery, which extended beyond by a single bay where the altar was lit by tall arched windows on either side and by a great east window.