A sign saying lateral flow coronavirus tests are out of stock is displayed in a pharmacy window in London, Thursday Dec. 30, 2021. Officials have warned revellers in Scotland and Wales to think twice before travelling to England to ring in the new year, highlighting how the four parts of the U.K. were again taking starkly different approaches to coronavirus restrictions amid record-high infections and soaring hospitalizations. Prime Minister Boris Johnson has resisted tightening restrictions in England despite the rapid spread of the highly transmissible omicron variant. (Dominic Lipinski/PA via AP)
