Built in 1827-8. ... a
design of vast scale, Baroque power and Grecian severity by William H.
Playfair ... His plan is basically a square, diagonally sited, with
the N and S corners cut off. Tower to the S, with a cavernous tunnel entry
reached by a stair between giant inverted consoles. The two upper stages
are equal in height with coupled antae at the corners, but otherwise
sharply different. One great window with a grille of segmental stone
tracery below, a clock face and a single median antae above. Corner
turrets with crosslets and fretted balustrade, highly effective from a
distance. Oblique flanks with solid end bays matching the lower part of
the tower. The three middle bays, deeply recessed between antae, have urns
above the cornice. ...