Cold weather is predicted to sweep into the UK with freezing fog forecast, as Public Health England issued a cold weather alert.
It said that "with the forecast of cold weather and some freezing fog patches for parts of England", it is urging people to "prepare for cold weather conditions and look out for those most at risk".
The Met Office on Friday warned there is a high chance the Midlands, East and South East of England and South West will experience cold weather from Sunday at 6pm until Tuesday at 6pm.
Dr Owen Landeg, Principal Environmental Public Health Scientist at Public Health England, said: "Older people and those with heart and lung problems are at risk of getting sick in cold weather.
"Keep an eye out for those who may need help staying warm, ensure they wear lots of thin layers and have everything they need.
"Below 18 degrees, changes to the body mean that the risk of strokes, heart attacks and chest infections increase so heating homes to this temperature is particularly important to stay well."
The Met Office's Deputy Chief Meteorologist Nick Silkstone said: "High pressure is in place across the UK this weekend bringing settled, mainly dry, but also cold weather for many.
"It will be colder than of late with temperatures dropping below freezing overnight - and a chance of widespread frost, but with sunny spells throughout the day.
"However, at the start of next week the chance of fog and cloud will increase across central and southern areas which will mean it will also feel colder by day."
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