Cold health alerts from the UKHSA have been upgraded to amber, external for the whole of England and will be in place until 12:00 on 6 January.
The alerts warn of a rise in deaths particularly among elderly and vulnerable people.
The Met Office has warned of injuries due to slips and falls on icy surfaces, which will develop quickly as sleet and snow clears.
New snow and ice warning is in place for a large swathe of England and Wales, including Chester and Greater Manchester down to London and Kent.
Elsewhere, final preparations are being made ahead of huge firework displays in Edinburgh and in London.
