And it also houses HQ London Wing ATC IIRC........
A classic Tube Station design by Leslie Green - using his signature oxblood red Burmantofts tiles.
Opened as a tube station "Brompton Road" in 1906 (Piccadilly Line between Knightsbridge and South Ken), closed in 1934, used as an Anti-Aircraft Ops Room by the gunners in WW2.