A Cold Weather Alert for England has been extended until Sunday.
The alert, which was initially due to expire on Friday December 15, has been extended through until noon on Sunday December 18.
Dr Agostinho Sousa, Head of Extreme Events and Health Protection at UKHSA, said: "As this period of cold weather persists throughout the rest of the week, it is important to check in on the wellbeing of those most vulnerable to the cold, including those over the age of 65 and those with pre-existing medical conditions.
Read more: Another weather warning as Met Office forecasts more snow in North East
"Try to heat the rooms you use the most to at least 18°C if you can and keep your bedroom window shut at night."
Meanwhile, the Met Office has added a snow and ice warning for most of Britain on Sunday, although temperatures forecast for Newcastle are higher than previous days, with a minimum of 3C predicted by the Met Office for Sunday.
Paul Gundersen, a Chief Forecaster at the Met Office, said: "Over the last week, the UK has been in a northerly airflow bringing cold, sometimes Arctic air, to the UK.
"We will still have this northerly influence to our weather patterns until the weekend, but then the cold conditions will lose exclusive dominance over the UK’s weather and we will move into a more changeable regime with relatively mild and relatively cold conditions vying for supremacy."
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