Being born in Plymouth I know the area shown in the photos very well. The foreshore just there is known locally as "Rusty Anchor". It is the mouth of the River Tamar and gives access to the Royal Naval Dockyard, Devonport. At the age of 8 I stood just there and watched HMS Amethyst return after "The Yangtze Incident", complete with ship's cat that had, allegedly, toured the decks as shells landed.
Amethyst was subsequently broken up at Oreston, just across the water from Plymouth. I went to the breakers yard and scrounged a bit of teak from her. One day I intend building a model of Amethyst and incorporating that bit of teak. At the time I scrounged it I had no plans for it, I just wanted a little bit of history.
Roger in France.