A new, tougher fourth tier of coronavirus restrictions for London and much of south-east England has come into force.

The whole of Wales has entered another lockdown. And the whole of mainland Scotland will begin a new lockdown from 00:01 on Saturday 26 December.

The planned relaxation of coronavirus rules at Christmas has been scrapped for tier four areas. People will only be allowed to celebrate Christmas with members of their own household and support bubbles.

Elsewhere in England - and in Scotland and Wales - the plan to allow "Christmas bubbles" for five days is being changed to Christmas Day only. In Northern Ireland one day between 23 and 27 December is allowed.

There will also be a travel ban between England and Scotland throughout the Christmas period.