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On the sign:
ENGLISH HERITAGE
Sir MANSFIELD CUMMING 1859–1923 First Chief of the Secret Service lived and worked here 1911-1922
The English Heritage Trust is a charity that cares for over 400 historical buildings, monuments and other places.
The sign is on the place where the first head of the British secret service lived. (SIS also known as MI6). The house was also used as the headquarters of the Foreign Section of the Secret Service Bureau. The sign was placed in 2015