On board the Type 12 general purpose frigate Plymouth (1959) alongside the south side of number 3 basin in Chatham Dockyard at the end of a modernization which commenced in August 1966. The ship is berthed starboard side to the quay. The photographer is the GWS 20 Seacat missile power room between 47½ and 51½ stations on the starboard side of 1 deck looking forward and to port showing a test bench with drawers and cupboards under and a transformer in the corner. The electronic test unit is empty. Two fuse panels and an armaments broadcast protection unit are against the port bulkhead. A junction box is against the forward bulkhead. A vertical format negative.