Farting Lane's Sewer Lamp
One of the old sewer gas based lamp's in London.
On steep Carting Lane near the Savoy is a Webb sewer gas lamp, the bulb of which was originally illuminated by sewer gases (or, to be more direct, it's nickname was Farting Lane).
Until the 1950s, the bowel movements of Savoy guests lit up the street outside and it was a highly successful early (if bizarre) form of recycling we guess.
This was until some dozy cretin of a motorist reversed his vehicle into the column rendering it quite unsafe for a public footway, not to mention imperilling the pedestrian population to foul whiffs.
The current lamppost is now run on normal 'gas'.
The Savoy Hotel
One of the must-know places to find a lavatory in an emergency.