Where Britain's 9.2-inch coastal guns came from

Were the 9.2-inch guns installed to protect British ports in 1940 taken from armoured cruisers, and do any survive?

The batteries combined purpose-built coast-defence marks with guns retained from armoured cruisers, and surviving examples can still be seen at Gibraltar, Bermuda, Rottnest Island, and other former imperial positions.

British 9.2-inch coast guns belonged to the same weapon family as guns fitted to armoured cruisers. Shore-service manufacture could omit some treatments that made naval guns more expensive, while retired naval weapons retained for training or testing could return to operational use. An appendix to the official British history is cited for 34 guns in fixed defences of home ports by November 1940. Surviving examples at Gibraltar, Bermuda, and Rottnest Island illustrate the family's use across distant coastal batteries. The exchange does not settle a clean division between the Mark IX and Mark X as naval or shore weapons: photographs and lists produce conflicting recollections, and use both ashore and afloat is acknowledged.