Heavy snowfall has hit parts of the UK, causing road and rail disruption.
Amber weather warnings of more snow and very low temperatures are in place for Tuesday, and police say driving conditions are “treacherous” in places.
The M20 in Kent was blocked by stranded lorries, hundreds of trains are cancelled and many schools are closed.
Kent, Surrey, Suffolk and Sussex are among the worst-hit counties, seeing 5-10cm of snow, while north-east England has received up to 8cm (3in).
Temperatures dropped well below freezing overnight, with Northern Ireland, south west England and East Anglia logging figures as low as -6C.
Altnaharra in the Highlands recorded -8.5C.
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The UK is experiencing what’s expected to be the coldest week of the winter, with snow sweeping westwards during Tuesday, increasingly moving into Scotland and the Midlands later in the day.
By Wednesday night, more than 20cm could have accumulated in some parts of eastern England and Northern Ireland.
BBC Weather meteorologist Gemma Plumb said: “On Wednesday and Thursday it is going to feel bitterly cold with a lot of areas seeing maximum temperatures below freezing.
“It will feel more like -10C or -14C in some parts and there will be heavy snow showers in the East, particularly in north-east England.”
The wintry conditions are causing travel disruption, with problems likely to spread as the snow continues.
Overnight, rail operators ran empty trains to keep tracks clear of snow, but hundreds of services have been cancelled.
- Southeastern has cancelled more than 100 services, with trains from Kent to London Victoria and Cannon Street affected. There have been signalling problems between Tunbridge Wells and Hastings, and cancellations to early morning trains between Sittingbourne and Sheerness
- Greater Anglia is running a limited service with fewer and slower trains between Norwich and Ipswich, and cities like London and Cambridge
- Greater Northern said fewer trains will be running between Kings Lynn and Cambridge in the morning, services between Kings Cross and Ely have been cancelled
- Tfl Rail will not start services until 7am, and will run a limited service between London Liverpool Street and Shenfield
- c2c in Essex is running a limited timetable and customers have been advised to check the revised timetable before they travel
- Southern is running an hourly service on its London Bridge to Uckfield line with additional coaches
Motorists are being urged to take extra care and in worst affected areas, to only travel if really necessary.
Lincolnshire Police police said it was dealing with five collisions by 06:30 GMT, and roads were “particularly hazardous”.
North Yorkshire Police have described road conditions in some areas as “treacherous”, with areas around Harrogate and Craven particularly affected.
The A19 in North Yorkshire was closed after a crash, and some lanes on motorways are blocked due to the snow.
In north-east England, the A1231, near Sunderland, was blocked by an overturned lorry.
Merseyside Police says it has received reports of a crash on the M62 before junction 5.
Dozens of schools across the UK are closed due to the adverse weather conditions, particularly in north-east England, Yorkshire, and the South East.
Closures have also been announced in Lancashire, Anglesey and northern and eastern Scotland.
On Monday, British Airways cancelled more than 60 short flights to and from London’s Heathrow airport ahead of the bad weather.
Emergency shelters have been opened across the country as councils offer extra accommodation to the homeless during the freezing conditions.
The offer of a hot shower, clean clothes, food and a bed can help save lives, homeless charity St Mungo’s said.
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