Covid: UK at 'critical juncture' as No 10 unveils three-tier alert system

Boris Johnson's plan will see areas of England graded in three tiers of restrictions

• Three-tier plan: what it means and how it may work
  
• Coronavirus - latest updates
• See all our coronavirus coverage

No 10 has warned that the UK is at a critical juncture" for controlling the spread of Covid as Boris Johnson prepares to lay out new rules that will see pubs and bars in areas with the highest infection rate forced to close.

The prime minister is expected to address the nation on Monday after a frantic weekend of discussion with local leaders from across the country.