It has this to do with Florence Nightingale: "The common soldier's saviour, the ideological leader of nursing reform, and a pioneering social reformer besides, Florence Nightingale (1820 - 1910) is arguably the most famous Victorian after Queen Victoria herself. She belongs to that select band of historical characters who are instantly recognisable: the Lady with the Lamp, ministering to the wounded and dying - albeit by the light of a Grecian lamp rather than the historically accurate, but less romantic, folding Turkish version - is an image permanently imprinted on the British national consciousness." (from the BBC website.)