Heavy snow causes travel chaos in parts of England
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Heavy snowfall across parts of England has caused travel chaos, forced schools to close and cut power supplies.
Severe snow warnings remain in place for east and south-east England, the East Midlands and Yorkshire and Humber.
Up to 20cm (8in) fell on Thursday night and many drivers had to spend the night in their cars or abandon vehicles.
Driving conditions are hazardous in some counties, and air passengers at Gatwick, Luton, Heathrow, Manchester and Stansted have been affected.
'Horrendous'
About 200 drivers on the M20 and M2 in Kent were stuck in tailbacks overnight.
Essex Police dealt with more than 180 weather-related incidents during the night, including more than 20 road collisions.
ADVICE TO ROAD USERS
Do not travel in severe weather unless journey is essential
Check local and national weather forecasts before setting out and take warm clothes, food, water, boots, a torch and spade
Drive with care even after roads are salt treated and keep your distance - it can take 10 times longer to stop in icy conditions
Source: Highways Agency
BBC Travel
Your pictures: UK snowfall
Suffolk Police say it has been an "horrendous night". They have dealt with 230 incidents after up to 15cm (6in) of snow fell in the county, and dozens of drivers were forced to spend the night in their cars.
Hertfordshire Police had more than 400 emergency calls through the night.
Scores of jack-knifed lorries and abandoned cars litter the roads in the worst affected areas. Thousands of children are starting their Christmas holidays a day early as schools in many counties have been forced to close.
Energy company EDF says electricity supplies have been cut off in parts of south-east and east England.
The worst affected areas in the east include Cambridge, King's Lynn and Ipswich. In Norfolk, several thousand properties are without power, and EDF said its engineers' efforts to restore power were being hampered by the bad weather.
Some 1,000 homes are also without power in Cumbria.
EasyJet said it had cancelled about 50 flights at Gatwick, Stansted and Luton airports.
Specific problems include:
• Gatwick airport was closed from 0015 until 0730 GMT. EasyJet cancelled all flights from there until 1130, with other delays and diversions continuing since it reopened
• Luton airport in Bedfordshire reopened at about 1115
• Heathrow and Stansted airports stayed open, but there were delays to flights there, as well as at Manchester airport. There are delays to the train and bus services in and out of Stansted
• More than 350 schools have shut in Kent, the same number in Hertfordshire and more than 200 in Suffolk. Norfolk, Cambridgeshire and Northamptonshire have each seen more than 100 close
• National Rail Enquiries has warned of disruption to train services on Friday, particularly in east and south-east England
• Sections of the M40 were closed during rush hour following accidents. Normal traffic conditions were expected to resume from 1030
• In Essex, more than 70 lorries got stuck in blizzards on the A120 near Harwich, and on the A12 near Colchester some drivers had to sleep in their vehicles until gritters and snowploughs arrived
• Roads in Norfolk, Suffolk and Cambridgeshire were reported to be hazardous
• Other roads affected include the M2 and M20 in Kent, and the A168 in North Yorkshire - partly closed northbound due to a jack-knifed lorry
• Between 30 to 40 cars were trapped behind two lorries, stuck on the A166 in East Yorkshire
• National Hunt racing at Ascot on Friday and Saturday has been abandoned due to snow
UK WEATHER WARNINGS
BBC Weather
Driving winds and sub-zero temperatures brought blizzard conditions to much of the UK late on Thursday and in the early hours of Friday.
The Met Office said the heaviest snowfall overnight was in Norfolk, Bedford and Buckinghamshire.
BBC Weather forecaster Sarah Keith-Lucas said: "We have already seen snow arriving across south-east and north-east England."
She said the worst affected areas in south-east England were Greater London, Medway and parts of Kent, which are seeing "extremely heavy snowfall".
Up to 20cm (8in) has fallen in some parts of North Yorkshire but there have been no reports of traffic problems.
Snow also fell in parts of the Brecon area of mid Wales and in the Neath area of south Wales.
Conditions in the south east of the country are expected to ease during Friday, with more cold and icy weather predicted for Saturday and Sunday.
White Christmas?
The Met Office says there is a moderate risk of heavy snow in north and western Scotland, Northern Ireland, north-west England and northern Wales on Sunday.
However, it said it was too early to say whether there would be a white Christmas.
A Met Office spokesman said: "Current indications show an ongoing battle between the colder air currently over the UK and milder air pushing in from the west. As a result the forecast for Christmas Day is still too close to call."
The Highways Agency said it had 94 winter maintenance compounds across England, with 25 in the south-east, and was able to treat all roads within three hours of severe forecasts.
A spokesman told the BBC that road users had to "play their part" and "drive appropriately".
"We are asking drivers to carry out simple vehicle checks before they set out; to carry a severe weather emergency kit in their vehicles and to monitor the traffic and weather conditions," he said.
