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Travellers at Heathrow Airport are experiencing delays and cancellations due to the winter weather. For Heathrow flight information click here.
Heavy snow is expected in parts of Scotland today, with forecasters warning of blizzard conditions and bitterly cold temperatures.
The Met Office issued alerts for central Scotland, Tayside, Fife, Grampian, the Highlands and the Borders, where 4in-8in (10cm-20cm) of snow was expected to fall, accompanied by strong to gale-force winds in some areas.
People should be prepared for the risk of disruption to travel and power supplies as temperatures hover around the freezing mark, forecasters said.
Edmund King, president of the AA, has warned of people driving so-called "snowman cars" by not clearing off the piles of snow on top of their vehicles before getting behind the wheel.
Rail commuters are facing delays of up to 60 minutes this morning because of the snow and icy conditions.
Flights have been stopped at Leeds Bradford Airport while snow is cleared from the airport's runway. Delays are expected as a result.
Stansted Airport has tweeted a photograph of its 'snow teams' clearing snow from it's runway.
The tweet adds that the airport is "open and operational".
Commuters face nightmare journeys as a layer of snow and icy conditions prove hazardous in the morning rush.
Virgin Trains warned of some cancellations in its services between London and Birmingham and the North West, while services into London King's Cross were also affected.
Eurostar, First Capital Connect, Southeastern, Southern and South West Trains were all facing disruption.
There were delays on some London Underground lines, mainly because of late finishes to engineering work, while the bad weather caused hold-ups on the London Overground service.
Heavy snowfall closed two major roads across the Pennines, the A628 Woodhead Pass and the A66 between Brough and Bowes.
The Highways Agency said both routes would be closed for some hours and advised drivers to find alternative routes across the Pennines.
At Heathrow, some 10% of flights were expected to be cancelled, particularly after 4pm when visibility is expected to be low.
Passengers were advised to check the status of their flights before travelling to the airport.
Thousands of schools will remain closed today as Britain continues to suffer in the grip of winter.
Students around the country will take an extra day off as schools remain closed in counties to the north and east of London.
A man was killed when the car he was driving left the road in wintry conditions.
The accident happened on the northbound carriageway of the A12 between Kelvedon and Marks Tey in Essex at about 7.05pm on Sunday.
Police found a Ford Mondeo had left the road and crashed into with a tree.
The driver, a 59-year-old man from the Colchester area, died at the scene.
His passenger, a 57-year-old woman, also from the Colchester area, was taken to Colchester General Hospital with serious but not life-threatening injuries.
Witnesses are asked to contact the Essex Police Serious Collision Investigation Unit on 101.