- U.K. Prime Minister Boris Johnson to announce three-tier lockdown systemCBS News
- New three-tier system spells tougher coronavirus restrictions for England – BBC NewsBBC News
- England to have 3-tier lockdown system amid ‘tipping point’The Associated Press
- Boris Johnson to unveil new measures to combat coronavirus in UK | TheHillThe Hill
- Johnson Set to Tighten U.K. Restrictions as Virus Cases MountBloomberg
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