Britain was covered in a film of frost with the country's travel network facing chaos as the temperature dropped.
The freezing fog played havoc with travel, with flights cancelled, roads jammed and delays on main line rail and Tube services - and forecasters have warned that the UK could experience the coldest day of the year so far.
It's beginning to look a lot like Christmas: Forecasters have warned that the UK could experience the coldest day of the year so far today
The wintry weather is set stick around until Thursday, with Press Association forecaster Matt Dobson saying: "This cold spell won't last. The fog will lift. But although the big change on Thursday night, with an Atlantic front moving in, will mean higher temperatures, there is likely to be a lot of wet weather.
"The south of England could be very wet on Friday and we are likely to see wet conditions all the way up to Christmas.
"The exception could be a short, cold snap in the weekend before Christmas."
For now, see the pictures below
Frost Covers The UK
Freezing Fog And Frost Hit The UK(01 of35)
LONDON, ENGLAND - DECEMBER 12: The early morning frost clings to a cobweb in Regents Park on December 12, 2012 in London, England. Forecasters have warned that the UK could experience the coldest day of the year so far today, with temperatures dropping as low as -14C, bringing widespread ice, harsh frosts and freezing fog. Travel disruption is expected with warnings for heavy snow in some parts of the country. (Photo by Dan Kitwood/Getty Images) (credit:Getty Images)
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British Airways planes wait to depart from Terminal 5 at Heathrow, London, as airports have been forced to cancel dozens of flights as ice and thick fog descended on the UK overnight. (credit:PA)
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Frozen berries on a tree in South Derbyshire. Freezing fog played havoc with travel today, with flights cancelled, roads jammed and delays on main line rail and Tube services. (credit:PA)
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A British Airways takes off as thick fog leads to cancelled flights at Heathrow Airport. (credit:PA)
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A British Airways plane as thick fog leads to cancelled flights at Heathrow Airport. (credit:PA)
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A horse stands in minus 3 degrees in a field near Heathrow Airport as thick fog leads to cancelled flights. (credit:PA)
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A man walks up Cam Peak in the Cotswolds as cold temperatures lead to a frost. (credit:PA)
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A jogger runs across frost covered grass in a park in London, Wednesday, Dec. 12, 2012. Flights at London's Heathrow and City airports have been disrupted by morning fog. (AP Photo/Kirsty Wigglesworth) (credit:AP)
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A severe overnight frost gives a seasonal look to Strensall Golf Club near York as early golfers set off on their round. (credit:PA)
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Hoar frost on a bush in Kemble, near Stroud, central England, as cold temperatures led to a severe frost. Overnight temperatures in the area dipped to -9 Celsius, 16 Fahrenheit. (AP Photo/PA, Tim Ireland) UNITED KINGDOM OUT NO SALES NO ARCHIVE (credit:AP)
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Hoar frost on a bush in Kemble, Gloucestershire, as cold temperatures lead to a frost. (credit:PA)
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The view from Cam Peak in the Cotswolds as cold temperatures lead to a frost. (credit:PA)
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Pedestrians walk along a bank of the River Thames just after sunrise in London, Wednesday, Dec. 12, 2012. Flights at London's Heathrow and City airport have been disrupted by morning fog. (AP Photo/Alastair Grant) (credit:AP)
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Fog clears from Tower Bridge which spans the River Thames in London, Wednesday, Dec.12, 2012. Flights at London's Heathrow and City airport have been disrupted by morning fog. (AP Photo/Alastair Grant) (credit:AP)
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A severe overnight frost gives a seasonal look to Strensall Golf Club near York as early golfers set off on their round. (credit:PA)
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Frost covers fields and trees near Arundel, West Sussex where temperatures failed to rise above zero degrees Celsius before lunch. (credit:PA)
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Frost clings to trees near Arundel, West Sussex where temperatures failed to rise above zero degrees Celsius before lunch. (credit:PA)
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Frost clings to a fence near Arundel, West Sussex where temperatures failed to rise above zero degrees Celsius before lunch. (credit:PA)
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General view of mist on the London Skyline as temperatures struggle to reach 2 degrees in the capital, London. (credit:PA)
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General view of mist on the London Skyline as temperatures struggle to reach 2 degrees in the capital, London. (credit:PA)
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Dog walkers in the frost at Rother Valley Country Park, near Sheffield. (credit:PA)
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Frost covers a sign near Arundel, West Sussex where temperatures failed to rise above zero degrees Celsius before lunch. (credit:PA)
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A horse feeds under a tree as frost covers fields and trees around Arundel, West Sussex, England, Wednesday, Dec. 12, 2012. (AP Photo/PA, Chris Ison) UNITED KINGDOM OUT, NO SALES, NO ARCHIVE (credit:AP)
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Frost covers fields and trees near Arundel, West Sussex where temperatures failed to rise above zero degrees Celsius before lunch. (credit:PA)
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People look at the trees at Westonbirt Arboretum in Gloucestershire as cold temperatures lead to a frost. (credit:PA)
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People look at the trees at Westonbirt Arboretum in Gloucestershire as cold temperatures lead to a frost. (credit:PA)
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A person walks past the trees at Westonbirt Arboretum in Gloucestershire as cold temperatures lead to a frost. (credit:PA)
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General view of mist on the London Skyline as temperatures struggle to reach 2 degrees in the capital, London. (credit:PA)
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People look at the trees at Westonbirt Arboretum, near Stroud, central England, as cold temperatures led to a severe frost. Overnight temperatures in the area dipped to -9 Celsius, 16 Fahrenheit. (AP Photo/PA, Tim Ireland) UNITED KINGDOM OUT NO SALES NO ARCHIVE (credit:AP)
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People look at the trees at Westonbirt Arboretum in Gloucestershire as cold temperatures lead to a frost. (credit:PA)
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A person looks out over a foggy scene near Dursley in Gloucestershire as cold temperatures lead to a frost. (credit:PA)
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Frost clings to a dinghy in Emsworth, Hampshire as the cold snap continues. (credit:PA)
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General view of mist on the London Skyline as temperatures struggle to reach 2 degrees in the capital, London. (credit:PA)
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A dog walker in the frost at Rother Valley Country Park, near Sheffield. (credit:PA)
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Dog walkers in the frost at Rother Valley Country Park, near Sheffield. (credit:PA)