At the west end is a vestibule, extending across the whole building, and occupying the space beneath the organ gallery and staircase. This is separated from the church by a fine stone screen, consisting of a large pointed arch, flanked by square open buttresses, and ornamented above with a range of upright divisions, finished with a blank cornice; in the centre is a bow, or projection in the corbel style, in the front of which is a dial. The doorway is formed of carved oak, representing tracery work and mullions, the upper part of the panelling being pierced and glazed. Above this screen is the organ, in a carved oak case, the design of which is an assemblage of three towers, with pinnacles at the angles, and united by flying buttresses, the wood work ornamented with upright arched panels.
On each side of the church are seven arches, resting upon six octangular columns, to each of which four small pillars are attached, an additional one being placed upon the capitals of those which are situated towards the body of the church, and carried up towards the vaulting. At each of the extreme ends of the arcade a semi column is attached to the walls, to complete the number necessary for sustaining the arches. The main pillars and arches are ornamented with a simple ogee moulding. The aisles are occupied by galleries that hide the lower divisions of the windows, which are only seen externally, no light being admitted below the galleries through the outer walls. Between the clerestery windows and the arcades below is the metzonine story, fronted by four cinque-foil headed arches, and finished with a cornice of roses in enriched quatre foils, designed as in imitation of the ancient trifolium.
The eastern window does not fill up the entire wall as we find in all ancient buildings, but a considerable portion of plain masonry is left round it. The space below is occupied by a splendid stone altar-screen of a beautiful antique design. It consists of five upright divisions, formed by the buttresses, the central being the width of two of the others; they are covered by ogee arches, with cinque foil sweeps in each, the centre one having a canopy of the same sort, but more highly enriched with a greater number of sweeps. From the canopies rises a series of upright divisions, with trefoil heads; and above is an entablature; the frieze of foliage in alto relievo; the cornice of various mouldings, and the whole is fronted by seven demi angels, in ancient costume, crowned; one hand of each is placed on the breast, the other held up in the attitude of benediction. The screen is flanked on each side by a magnificent composition of niche work, ranging above two small doorways leading to the vestry, the arches of which are obtuse, and the architraves entirely formed of mouldings. Above the point of the arch of each door case is an hexagonal canopy, highly enriched, and supporting the pedestal of a large and similarly formed niche above it, crowned with a like canopy, which rises above the rest of the screen, and occupies a portion of the wall on each side of the window. The pierced stonework, elegant buttresses, and minute pinnacles of this elegant composition, form an assemblage of architectural ornament which would not disgrace any age in which the pointed style prevailed; the scale of grandeur in which they are executed, and the general tastefulness that marks the design, together with the correct style of the elaborate details, would do honour to a cathedral.