 Depot buildings formerly associated with the castle still survive in the area immediately to the north-east.The earliest is a gunpowder magazine of 1857 (built to the same design as the 1810 magazine, which formerly stood alongside to the south but was demolished in the 1960s; these buildings had space for 33,000 barrels of powder between them).Between the magazines and the castle a Shifting House (for examining powder) had been built in 1811; both it and an adjacent shell store of 1857 were likewise demolished in 1964.