Hm Prison Gatehouse Including Adjoining Building to North and South and the Perimeter Wall

H.M. Prison Gatehouse, built between 1825 and 1828 by William Parsons, includes adjoining buildings to the north and south, as well as a perimeter wall. An addition was made between 1844 and 1846 by M.J. Dain. The gatehouse is constructed of ashlar stone and features a castellated parapet on a corbel table, along with large circular castellated angle turrets that have arrow loops. The entrance is a four-centred arch set in a recess, with a moulded depressed arch and a mock portcullis. To the right and left of the gatehouse are matching blocks from 1844 to 1846, also made of ashlar and two storeys high, with smaller circular turrets that have battlements. The Governor's House on the left projects forward and has stone mullion and transom windows, along with stone chimneys that have moulded cornices. Behind the gatehouse is a high, unbroken perimeter wall built between 1825 and 1828, made of red brick with a slight batter. The wall features circular buttress turrets at intervals and larger angle turrets, all topped with stone caps and coping. The polygonal beehive-like tower at the center, built in 1828, is made of brick and castellated, with six-spoke wings, some of which have been demolished. There is also a large rectangular block from around 1846 or 1847, which has a slate hipped roof and two large hexagonal chimneys.