Key points:

• MPs debating and voting on PM’s lockdown measures – Labour expected to vote with government
• Labour leader Sir Keir Starmer holding news briefing in central London at 5pm
• 17,234 new UK cases today – up from 13,972 on Monday.
• Three-tier lockdown system – Medium, High and Very High – comes into force in England from midnight
• What are the new tiers and which is your area in?
• SAGE recommended ‘circuit breaker’ lockdown to ministers three weeks ago, it emerges
• Essex requests tougher restrictions, as Sadiq Khan says London may soon move up a tier
• Government admits it could impose further restrictions beyond those announced yesterday
• First US coronavirus reinfection confirmed
• Footballer Cristiano Ronaldo has tested positive for COVID-19
• Live reporting by Emily Mee, news reporter, and Greg Heffer, political reporter