The Flag Ship Building

The Flag Ship Building is an industrial structure constructed from red brick with slate roofs. It features two parallel sections, with the taller northern range and a shorter southern range that backs onto a square base of a brick octagonal chimney. The northern range has gables at each end, although the eastern gable is obscured by an early 20th-century brick lean-to. The western gables facing the river are made of hard red brick with yellow brick detailing. The northern range includes a coped gable on the left and a lower stepped coped gable on the southern range.

The end of the northern range has a first-floor recess with a moulded brick head, which contains a yellow-brick roundel above arched windows that also have yellow brick heads and an impost band. Below, there is a yellow brick sill course interrupted by a small opening with a yellow brick arched head. The ground floor features a broad entry on the left with a cambered head and an arch-headed window on the right, both adorned with yellow brick heads and an impost band.

The southern range has a roof with a long raised clerestory light along the ridge. Its gable end displays continuous brickwork and a similar cambered-headed broad entry in the center, with the impost band continuing from the northern range and a roundel at the first floor. The gable is coped with an apex stepped up to terminate the clerestory light, resting on short yellow brick piers supported by corbels. The southern side of the lower range had a lean-to that has been removed, revealing a wall of rough red brick infill between iron posts and beams. The building has seven bays in total.

The chimney on the eastern side stands on a square base with a stone cornice. A former engine house runs parallel to the chimney on the southern side, featuring similar details and a clerestory roof. The end walls of the engine house have a stepped gable, while the southern side has rough brick infill between iron piers in three bays. The eastern end includes a broad entry with a yellow-brick cambered head and an impost band.

The northern side of the northern range is constructed of rough brick and has loading doors on the ground floor, with the upper part set back in panels and some inserted windows. The eastern end gable is obscured by a two-storey added lean-to that is roughly built. It is noted that the freezing floor is believed to be located below the modern floor.