St. Ermin’s Hotel is a four-star luxury hotel located at 2 Caxton Street, London SW1H 0QW, near St James’s Park Underground station and close to Westminster Abbey, Buckingham Palace, and the Houses of Parliament. It is housed in a Grade II-listed late Victorian building originally built as a mansion block in 1887-1889 and converted to a hotel by 1899.
The hotel is known for its historic significance as a former British intelligence haunt during WWII 
 
Interesting facts...
St. Ermin’s Hotel was a hub for British intelligence, especially during WWII and the Cold War. It earned the nickname “the Works Canteen” among MI5, MI6, and Admiralty officers, who used its Caxton Bar for both relaxation and clandestine meetings-even with Russian handlers.
The infamous Cambridge Five double agents, including Guy Burgess and Kim Philby, openly met their Soviet contacts here, sometimes passing documents in plain sight.
In 1938, MI6’s Section D, specializing in sabotage and demolition, took over the hotel’s top floors and kept a stockpile of explosives above unsuspecting guests.
The Special Operations Executive (SOE), created by Churchill to wage unorthodox warfare, was headquartered here under the cover name “Statistical Research Department.” Agents were trained, equipped, and dispatched from the hotel.
Notable figures like Ian Fleming (creator of James Bond), Noël Coward, and Anthony Blunt were connected to the hotel’s intelligence activities