The mural towers flanking the gateway are parts of circles, 16 feet 6 inches external diameter, and the lower 12 feet are original. One contains a curious vaulted basement with the usual three loops, and in the rear a doorway which opened into the ward. The other, or eastern flanker, had a basement chamber until recently filled with earth, and had also three loops, of which two are still visible outside. This tower was connected with a building in its rear, the foundations of which are original, and now form a part of the offices. Also upon the retaining wall, but about 20 yards beyond, and to the south-west of the old gateway, is another similar flanking tower, of which the upper story remains, and a part of a doorway. This tower is open in the rear. The towers, curtain, and entrance gateway are, in substance, all of one date, and what ashlar remains is of good quality and well jointed. The superstructure has been renewed recently. The approach to the castle was steep, as it still is, from the town up to the old gateway, to enter which the road made a sharp turn. Just below the gateway, upon this approach, has been built a gatehouse, which projects from and is connected with the curtain, being incorporated into the tower, flanking the old curtain on the west side. This structure, the great gatehouse, still remains perfect, and, though evidently intended more for ornament than defence, makes a most appropriate approach to the castle, and gives to the whole structure much of a mediæval and something of a military character. This building is rectangular, 63 feet broad by 23 feet deep, and about 45 feet high, sixty-two steps leading to its battlements. It is pierced by a passage 10 feet 6 inches broad, having a plain pointed waggon vault, and at each end a not very highly pointed arch, with good moulded jambs continued round the head. There are no lodge doors opening into the archway, and neither portcullis nor drawbridge. The fronts are plain, save that the exterior has two flanking buttresses, and over the entrance is a rectangular panel containing nine coats of arms in three rows—one, four, and four. The interior front is flanked by two half-hexagonal turrets, of which that at the outer end contains a well-stair, entered from the outside by a small four-centred doorway, and communicating with each floor, and with the battlements. The corresponding turret is built upon one of the old mural towers which flanked the gateway of the lower ward. It contains a small chamber, probably a garderobe, on each floor. Against the outer end of the building are two buttresses, a large and small one, probably added to support the wall which then stood upon a steep slope and showed signs of settlement. The gatehouse is of three stages. The basement has a chamber on each side of the main passage, entered, one by the well-stair, the other by an exterior door. That next the well-stair is 14 feet 6 inches by 9 feet 8 inches, and has a window to the front.