The north wall, with the exquisite two-light lancet windows, is Early English, and dates from the period immediately after the demolition of the Norman choir about 1260.
Each compartment of the cinquefoil wall-arcade is separated by triple columns, and the space divided into four parts by shafts, barely detached from the wall, supporting foliated arches. This is the general description for both north and south choir aisles.
The eastern bay belongs to the retro-choir, and is of later date.
Above the wall-arcade are the graceful two-light lancet windows, with their slender columns, deep mouldings, and rich dog-tooth decoration.
In each bay there are four divisions; the two outer ones blank, and the two others forming the window. The shafts are detached from the wall; the central one is higher than the rest, and its capital is foliated. From the outer columns in the blank divisions, the shoulder, or hipped rib, after rising a short distance, sinks to the level of the capitals of the vaulting columns. At the side of the window columns two small circular mouldings, decorated with small dog-tooth ornament, continue without a break round the head of each window. A large blank quatrefoil is inserted in the space between the lights and the outer arch moulding.
The corner column (north side of entrance) has been inserted by cutting away part of the east wall of the north transept. Like the aisle it dates from about the last half of the thirteenth century. On its capital there is the spring of a pointed arch, enriched with dog-tooth ornament similar to the entrance arch.
Probably it was intended to pull the north transept down, and rebuild it with the addition of an eastern aisle. This column would then have been part of it. The existence of an offset on the north face of the aisle wall, with the return of the base-course and string-course upon it, seems to add weight to this theory.
The nearest clustered column to it has also been altered, and consists of five shafts instead of three. A rib springs from the additional shafts to the centre of the corner column. There are also remains of groining like that of the aisle.