In the most recent TNA podcast, recorded earlier this month, GIs and POWs: Kew in the Second World War, historian Christopher May reveals the wartime history of The National Archives' Kew site. The presentation focuses on the site user by American servicemen stationed there created the maps used in the Normandy landings of 1944, and the use of the same buildings to house Italian prisoners of war who helped to clear bomb damage in London.
The site was taken over by the UK Public Record Office in 1972.
Not much of family history interest in the presentation, interesting local history.
Find it at www.nationalarchives.gov.uk/podcasts/gis-and-pows.htm