On board the County class guided missile destroyer London (1961) alongside the fitting out berth at the Neptune Works of Swan, Hunter & Wigham Richardson Ltd at Wallsend-on-Tyne. The ship is berthed starboard side to the quay. The photographer is in the GWS 21 Seacat missile power room and local maintenance annexe between 114 and 123 stations on the centreline of 1 deck looking to port of the centreline showing a power supply board, a rectifier, a transformer and two emergency change over switch and control boxes are on the right. A control panel for a motor generator, a retransmission unit and four test terminal boxes are on the left. A vertical format negative.