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The Mayor of London, Sadiq Khan, has activated the pan-London Severe Weather Emergency Protocol to protect homeless people as temperatures are forecast to fall below 0°C overnight. It's the first time the protocol has been activated this winter. London's coldest night is forecast for Friday when temperatures could drop to -3°C. So what's behind this latest cold snap for the capital? And how long will it last? Â鶹Éç Radio London's Salma El-Wardany has been speaking to Met Office Meteorologist Clare Nasir. (Image credit: Getty Images)