People with medical conditions have been urged to heat their homes to at least 18C as Britain braces for a cold snap of winter weather this week.
The Met Office has issued a severe cold weather alert for England and warned that falling temperatures, which may plummet as low as -10C in some areas, could increase health risks to vulnerable people.
The level three, or amber, cold weather alert was issued on Monday morning and warns of severe conditions in England between 6pm on Wednesday and 9am next Monday, 12 December.
The alert requires social and healthcare services to take action to protect high-risk groups.
Government health advisers have warned the elderly and those with medical conditions to make sure their homes are warm enough.
Dr Agostinho Sousa, consultant in public health medicine at the UK Health Security Agency (UKHSA), said: “Cold weather can have serious consequences for health, and older people and those with heart or lung conditions can be particularly at risk.
“If you have a pre-existing medical condition, you should heat your home to a temperature that is comfortable for you.
“In rooms you mostly use such as the living room or bedroom, try to heat them to at least 18C if you can.
“Keep your bedroom windows closed at night. Wearing several layers of clothing will keep you warmer than one thicker layer.”
As well as the cold weather alert for all of England, a yellow national severe weather warning for snow has been issued for Wednesday covering northern Scotland.
Met Office deputy chief meteorologist, Rebekah Sherwin, said: “Temperatures will start to dip this week, with daytime temperatures struggling to get above freezing in many places from mid-week onwards.
“Showers will turn more wintry as the week goes on with a risk of snow at times.
“We can expect to see some snow and wintry showers further south as the week progresses, particularly in coastal areas or over higher ground.