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On the sign:
CITY OF WESTMINSTER
AMBROSE GODFREY 1660 - 1741 CHEMIST AND INVENTOR OF THE FIRE EXTINGUISHER WHO LIVED IN A HOUSE AND WORKED AT A LABORATORY AND PHARMACY ON THIS SITE BETWEEN 1706 AND 1741
The house where he lived and was also the laboratory of the German-born chemist Ambrose Godfrey (Ambrose Godfrey-Hanckwitz), one of the producers of phosphorus at that time who was also a pharmacist. Godfrey is also known as the inventor of the fire extinguisher.