I knew about doctor codes, but not Inspector Sands. I wonder would I remember if it actually happened though. :)

Inspector Sands is a code phrase used by public transport authorities in the United Kingdom, including Network Rail and London Underground, to alert staff to a fire alarm without needing to evacuate the station. The exact wording depends on the station and the nature of the incident. For example: “Would Inspector Sands, please report to the operations room immediately.” or “Would Inspector Sands, please report to Platform 2.”