![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](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/AKJHBTWEWHZI6Z7UE3K66OZQJA.jpg?smart=true&auth=b0e546bdfc86c5f1a81af916b0097709efc691b91ac8273d197ff021800c0638&width=400&height=225)
Boris Johnson has introduced a three-tier alert system for coronavirus. AFP
Boris Johnson has introduced a three-tier alert system for coronavirus. AFP
How does England’s three-tier Covid alert system work?
Millions of people face tough restrictions to curb second wave