Almost 18 million people
have entered tier four restrictions in London and large parts of the east and south-east of England after a new coronavirus variant led cases to soar – and all of Wales has also gone into lockdown. In south-east England, the stringent lockdown measures mean people will not be able to mix with other households over Christmas. In the rest of England, Scotland and Wales, relaxed indoor mixing rules have been cut from five days to Christmas Day only. So, what is tier four and who is in it? And what are the new rules for Christmas everywhere?