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 in the mortar metadyne room between 65 and 67 stations on the centreline of 3 deck looking forward from the door showing a bench on the left. Against the forward bulkhead are a fuse box and a resistance box for A/S mortar Mark 10 No. 2, manufactured by Metropolitan-Vickers Electrical Co Ltd. Two junction box cover panels are on the deck leaning against the forward bulkhead. A vertical format negative.