Pedestrians walk past a NHS sign displaying guidelines during the novel coronavirus COVID-19 pandemic, on a bus-stop shelter in the West End of London on October 14, 2020.  Prime Minister Boris Johnson on Wednesday said a new UK-wide lockdown would be a "disaster" but refused to rule it out as demands grew for a temporary shutdown to stop the spread of coronavirus.
 / AFP / Tolga AKMEN
Boris Johnson has introduced a three-tier alert system for coronavirus. AFP

How does England’s three-tier Covid alert system work?




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