Royal Naval Training Establishments ashore and afloat

Mainly those existence during World War Two but not necessarily so.

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This book
HMS Caledonia, the ship then the establishment, was used for Artificer Apprentice training. Gil Harding, using the memories of ex-apprentices and staff of HMS Caledonia from 1937 to 1983, has compiled an entertaining and informative account of an often unsung branch of the Royal Navy.
This book

All that's left !