Hanukkah in the Square is London's biggest celebration of Hanukkah, the Jewish festival of light.
The festival commemorates the triumph of the Jews over their Greek assailants in a battle more than 21 centuries ago.
These days, the festival has come to be a more general celebration of good over evil and freedom over tyranny.
Jews across the capital celebrate Hanukkah by lighting candles every day for eight days on a special candelabra called a menorah.
At this central London celebration, Mayor of London Boris Johnson lit the first candle and the Chief Rabbi of the UK Ephraim Mirvis led the blessings.
Louise Scodie went to find out more.