Britain faces another day of travel disruption on Saturday as heavy snow that blankets much of the country turns to ice.

Hundreds of passengers were left stranded on Friday as airports across the UK suspended flights, and motorists struggled through blizzards along treacherous roads.

British Airways apologised to people trapped on planes in appalling weather at Heathrow airport as they waited for a slot to take off, and hundreds of others had flights cancelled.

More than 400 flights were cancelled at the airport, and hundreds of people spent the night on the floor as they waited for flights to be rescheduled.

uk snow

Roads, airports and railtracks will all be affected for a second day on Saturday

The arctic blasts forced nearly 2,000 schools to shut their doors, meaning some sixth-form and college students had their A-level exams postponed.

But the weather heaped misery on more than 10,000 households in South Wales, where residents found themselves with no power for the morning.

There are warnings of further misery today. Darron Burness, the AA's head of special operations, said: "With the snow compacting down and turning icy, we're likely to see treacherous driving conditions throughout the weekend.

"Any fresh snow on top will just add to the problems."

The Met Office is forecasting less snow, but has issued yellow warnings for ice over much of the country. The Highways Agency said its fleet of snow ploughs and gritters will continue to be out in force across the weekend to ensure roads are passable.

uk snow

Fresh snow is likely to fall across the country, including central London

This morning the M48 Severn Bridge was closed in both directions between junctions one and two because of hazardous conditions.

Rail travellers experienced upheaval on Friday as operators scrapped services.

South West Trains will run an amended timetable on Saturday as a precaution against the heavy snowfall, while the Eurostar will run with speed restrictions because of snow and ice in the UK and northern France. Two services have also been cancelled.

Snow fell across much of the UK, with South Wales experiencing the worst of the weather, forcing the Met Office to issue a "red" severe weather warning.

uk snow

Heathrow was forced to cancel more than 400 flights on Friday, with more expected on Saturday

Sennybridge in Powys had 10in (25cm) of snow, while many other places across the UK saw between 2in (5cm) and 4in (10cm).

Further snow fell overnight in the Midlands and London, while Suffolk and Essex had up to 1.5in (4cm), Paul Mott, a forecaster with MeteoGroup, the weather division of the Press Association, said.

Heavy snow showers are expected to develop across parts of northern England and eastern parts of Scotland, with up to 4in (10cm) falling locally over the North York Moors.

Temperatures are likely to remain low - down to about -3C (37.4F), and ice is expected to form on any untreated roads.

Loading Slideshow...
  • Winter weather Jan 25

    A man uses a tractor as he tries to try and keep the roads open in Tanfield, Durham as more snows falls in the UK.

  • Winter weather Jan 25

    A woman digs her way out after more snow falls today in Tanfield County, Durham.

  • Winter weather Jan 25

    A woman digs her way out after more snow falls today in Tanfield County, Durham.

  • Winter weather Jan 25

    A man uses a tractor as he tries to try and keep the roads open in Tanfield, Durham as more snows falls in the UK.

  • Winter weather Jan 25

    A woman digs her way out after more snow falls today in Tanfield County, Durham.

  • Winter weather Jan 25

    A woman digs her way out after more snow falls today in Tanfield County, Durham.

  • Winter weather Jan 25

    Two woman battle through the snow after more snow falls today in Tanfield County Durham.

  • Winter weather Jan 25

    A man shovels snow after more snow falls today in Tanfield County Durham.

  • Winter weather Jan 25

    A woman digs her way out after more snow falls today in Tanfield County, Durham.

  • Winter weather - Jan 22nd

    A man struggles in the snow as he walks past the starters box on the PGA Centenary Course after more snowfall today at Gleneagles Hotel in Perthshire. The course will be used for the 2014 Ryder Cup.

  • Winter weather - Jan 22nd

    A road traffic sign covered in snow and ice at Spring Cottage, Derbyshire as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    People struggle in the snow with shovels on a golf course at Gleneagles after more snowfall today in Perthshire.

  • Winter weather - Jan 22nd

    A man struggles in the snow as he walks past the starters box on the PGA Centenary Course after more snowfall today at Gleneagles Hotel in Perthshire. The course will be used for the 2014 Ryder Cup.

  • Winter weather - Jan 22nd

    A man walks his dog near Auchterarder, Perthshire after heavy snowfall overnight.

  • Winter weather - Jan 22nd

    Loggers Trucks collect trees in Kielder Forest, Northumberland where snow fell overnight.

  • Winter weather - Jan 22nd

    Snow and ice cover barges and boats at Foxton Locks in Market Harborough, Leicestershire as the winter weather continues across the UK

  • Winter weather - Jan 22nd

    General view of a street in Pricetown, Dartmoor, as snow starts to fall again.

  • Winter weather - Jan 22nd

    Don Clegg, 80, clears snow from his drive in Kielder, Northumberland as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    Loggers Trucks battle up the hill in Kielder Forest, Northumberland where snow fell overnight.

  • Winter weather - Jan 22nd

    A man fits snow chains to his car in preparation for driving in hazardous conditions as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    Don Clegg, 80, in his garden in Kielder, Northumberland as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    Loggers Trucks collect trees in Kielder Forest, Northumberland where snow fell overnight.

  • Winter weather - Jan 22nd

    Loggers Trucks collect trees in Kielder Forest, Northumberland where snow fell overnight.

  • Winter weather - Jan 22nd

    Mum Stephanie Koch (right) and daughter Kadie 4 enjoy the snow in Kielder, Northumberland as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    Dogs walking in Innerleithen, the Scottish Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    A car sets off down a snow covered road in the Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    A snow covered road in Galashiels the Scottish Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    A horse runs along a snow covered field in the Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    Sheep look for food in the Scottish Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    A snow covered road in Galashiels the Scottish Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    A car sets off down a snow covered road in the Borders as snow showers hit the East of Scotland.

  • Winter weather - Jan 22nd

    Mum Stephanie Koch (right) and daughter Kadie 4 enjoy the snow in Kielder, Northumberland as the winter weather continues across the UK.

  • Winter weather - Jan 22nd

    Snow and ice cover Foxton Locks in Market Harborough, Leicestershire as the winter weather continues across the UK

  • Winter weather - Jan 22nd

    Snow and ice cover Foxton Locks in Market Harborough, Leicestershire as the winter weather continues across the UK

  • BRITAIN-WEATHER-SNOW

    A woman walks a dog through a snow covered Rose Garden at The Arno in Birkenhead, northwest England, on January 21, 2013. Britain is braced for a continuation of the bad weather which has left closed schools and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

  • UK Hit By Heavy Snow Fall

    NOTTINGHAM, UNITED KINGDOM - JANUARY 21: Freddy the Boston Terrier plays in the snow on January 21, 2013 in Nottingham, United Kingdom. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Laurence Griffiths/Getty Images)

  • UK Hit By Heavy Snow Fall

    NOTTINGHAM, UNITED KINGDOM - JANUARY 21: Canada Geese fly from the snow covered banks of the River Trent on January 21, 2013 in Nottingham, United Kingdom. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Laurence Griffiths/Getty Images)

  • UK Hit By Heavy Snow Fall

    NOTTINGHAM, UNITED KINGDOM - JANUARY 21: Wild birds feed on the snow covered banks of the River Trent on January 21, 2013 in Nottingham, United Kingdom. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Laurence Griffiths/Getty Images)

  • UK Hit By Heavy Snow Fall

    LONDON, UNITED KINGDOM - JANUARY 21: A snowman complete with cigarette and coffee cup is viewed by a squirrel in St James's Park on January 21, 2013 in London, England. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Peter Macdiarmid/Getty Images)

  • UK Hit By Heavy Snow Fall

    NOTTINGHAM, UNITED KINGDOM - JANUARY 21: Canada Geese fly from the snow covered banks of the River Trent on January 21, 2013 in Nottingham, United Kingdom. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Laurence Griffiths/Getty Images)

  • UK Hit By Heavy Snow Fall

    LONDON, UNITED KINGDOM - JANUARY 21: A woman walks on Birdcage Walk as snow falls on January 21, 2013 in London, England. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Peter Macdiarmid/Getty Images)

  • BRITAIN-WEATHER-SNOW

    Models pose around a plastic palm tree in the snow in front of Tower Bridge in central London on January 21, 2013, during a 'pop-up beach resort' promotion on the day that many consider to be the most depressing day of the year. Britain is braced for a continuation of the bad weather which has schools closed and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images)

  • BRITAIN-WEATHER-SNOW

    A woman walks a dog through a snow covered Rose Garden at The Arno in Birkenhead, northwest England, on January 21, 2013. Britain is braced for a continuation of the bad weather which has left closed schools and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

  • BRITAIN-WEATHER-SNOW

    People walk a dog through a snow covered Arrowe Park in Birkenhead, northwest England, on January 21, 2013. Britain is braced for a continuation of the bad weather which has left closed schools and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

  • BRITAIN-WEATHER-SNOW

    A woman walks a dog through a snow covered Rose Garden at The Arno in Birkenhead, northwest England, on January 21, 2013. Britain is braced for a continuation of the bad weather which has left closed schools and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

  • UK Hit By Heavy Snow Fall

    NOTTINGHAM, UNITED KINGDOM - JANUARY 21: Canada Geese fly past the snow covered banks of the River Trent on January 21, 2013 in Nottingham, United Kingdom. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Laurence Griffiths/Getty Images)

  • UK Hit By Heavy Snow Fall

    LONDON, UNITED KINGDOM - JANUARY 21: A man walks on The Blue Bridge over the partially frozen lake in St James's Park on January 21, 2013 in London, England. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Peter Macdiarmid/Getty Images)

  • BRITAIN-WEATHER-SNOW

    People walk a dog through a snow covered Arrowe Park in Birkenhead, northwest England, on January 21, 2013. Britain is braced for a continuation of the bad weather which has left closed schools and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

  • BRITAIN-WEATHER-SNOW

    Models in swimwear pose in the snow at a 'pop-up beach resort' promotion in front of Tower Bridge in central London on January 21, 2013. Britain is braced for a continuation of the bad weather which has schools closed and caused transport chaos in recent days, with several weather warnings in place. AFP PHOTO / CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images)

  • UK Hit By Heavy Snow Fall

    LONDON, UNITED KINGDOM - JANUARY 21: Pigeons look for food in a snowy St James's Park on January 21, 2013 in London, England. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Peter Macdiarmid/Getty Images)

  • UK Hit By Heavy Snow Fall

    LONDON, UNITED KINGDOM - JANUARY 21: Pigeons try to keep out of the snow by resting on a signpost in St James's Park on January 21, 2013 in London, England. The United Kingdom has suffered a weekend of heavy snowfall with many transport routes affected. (Photo by Peter Macdiarmid/Getty Images)