Two yellow warnings for snow and ice remain in place
Rail disruption across the UK's train operators
Flood alerts and warnings in the North East and south-west England
Friday's Lewisham trains disruption being investigated
Some bitterly cold weather in Malmesbury, Wiltshire, has frozen this water fountain, captured by Nigel Roberts.
A pretty sight as water feature freezes in Malmesbury.
The Met Office said Storm Emma, which has been named by Portugal's weather service, could bring blizzards and freezing rain later in the week.
The storm is out in the Atlantic at the moment but may bring snow and gales to Britain on Thursday and Friday.
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Families are making the most of the hundreds of school closures today.
Image source, Getty ImagesPeople are flocking to Jacksons Field in Rochester, Kent, where snow is heavy and perfect for sledging.
Image source, Getty ImagesIn Rochester, temperatures are -1C, colder than Reykjavik in Iceland.
Image source, PAIce cream anyone? Brett Canham prepares his catering stall on Scarborough seafront after several centimetres of snow fell overnight.
Image source, Getty ImagesA snowman on the seafront in Crosby, Liverpool, where temperatures are a balmy 1C.
Image source, PAThursday marks the official start of spring - but Scarborough North Bay beach in Yorkshire looks very wintry.
Some of you are taking drastic measures...
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BBC Wales News
These children in Wales have been celebrating a day off school thanks to the snow.
Some 234 schools have closed in Wales because of the weather.
You can see for yourself how they took the news.
Snow school celebrations for pupils
BBC Breakfast
Alan Titchmarsh has urged gardeners not to worry about their outdoor spaces during the extreme weather and just enjoy the scenes.
Appearing on BBC Breakfast, he said: "If you've got evergreens - trees, if you can reach the trees, and shrubs - and snow is settling on evergreens, go out with your camera and take the photograph because it looks pretty.
"But then knock it off, because when it starts to thaw it gets very, very heavy and that is when branches break and that is when things like cedar branches are brought down, thawing snow."
He also told gardeners to avoid walking on lawns and planting things while it is frosty.
Roads across the south of England have been heavily hit by the snow.
Image source, Dan Kitwood/Getty ImageSome people have needed a helping hand in the snow
Image source, Gareth Fuller/PA WireThe M20 in Kent ground to a halt
Image source, Dan Kitwood/Getty ImagesTraffic was also affected in Rochester
Image source, PADrivers like these in Ashford are being urged to take care
The Met Office has updated its weather warnings, external to include a forecast of severe snow, ice and wind later in the week.
Three people have died in a crash involving a car and lorry in Lincolnshire.
Earlier we reported there had been a "very serious" crash on the A15 at Baston, with Lincolnshire Police warning drivers to take care in the conditions.
The force has now confirmed three people died in the crash, external which involved a blue Renault Clio and white Scania lorry at about 06:15. Police are appealing for witnesses.
The Met Office has said it is "really important people do what they need to do" to stay warm.
Dr Thomas Waite, of the extreme events team, said: “Heating homes to at least 18C will help keep you healthy. Also make sure you eat warm food, move about at home and wear several thin layers instead of fewer thicker ones.
“Cold temperatures inside and out can make you ill and can even kill. Prolonged cold weather like this can be a challenge to all of us; remember that staying warm helps keep you healthy.”
Image source, Dan Kitwood/Getty ImagesAnimal charities the Blue Cross, external and Battersea Dogs and Cats Home, external are issuing tips for pet owners to protect their dogs and cats from the big freeze.
Tips include:
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BBC News Scotland
The worst of the weather in Scotland is expected to be on Wednesday and Thursday, with Police Scotland warning of potential disruption to trunk roads and urging people to only travel if necessary.
Trains, planes and ferries are also likely to be affected, with a wind chill that could see parts of the UK feeling as cold as minus 15C (5F).
BBC News
Parts of the UK have been transformed by a blanket of snow.
You can see more pictures here.
Image source, PAThe "Beast from the East" struck Newcastle and north east England over night
Image source, Getty ImagesSome people, like these beside Rochester Castle in Kent, took the opportunity to go sledging
Image source, Sue PinneyAccording to the Met Office, up to two centimetres of snow is expected widely throughout today with the potential for five to 10cm in some areas.
There's already up to 15cm of snow in some parts of the south east.
By Thursday, the Met Office said 40cm is possible in some places.
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As well as contending with the current cold, the UK may well have another storm to contend with later this week.
Storm Emma, as it has been named by the Portugese Met Service, is due to move north through Europe and hit the UK on Thursday, the first day of the meteorological spring.
The Met Office says the storm could be "significantly disruptive" bringing the risks of power cuts and further transport delays.
A spokesman said: "This brings the potential for a spell of significantly disruptive snow across southern UK, while gales and freezing rain could pose additional major hazards in places, increasing the risk of power cuts."
Kent is among the worst-hit counties for snowfall this morning.
Here the "Garden of England" is seen from above, covered in white.
Snow covers parts of Kent
The lowest overnight temperature recorded in the UK on Monday night was at Farnborough in Hampshire where it was -8.9C (16F).
The Met Office's chief forecaster Frank Saunders says parts of the country could see their "coldest spell of weather since at least 2013, and possibly since 1991".
It is expected that the mercury could plummet to -15C (5F) by midweek where there is snow on the ground, rivalling temperatures forecast for parts of northern Norway and Iceland.
The older people's charity Age UK is asking the public to look out for the elderly during this bout of cold weather.
It suggests inviting an elderly neighbour round for a cup of tea or offering to salt their icy front step.
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Victoria Fritz
BBC transport correspondent
Lots of people are very angry this morning saying there might be just a few flakes out there and they have cancelled all the trains, but it's not necessarily to do with the volume of snow.
In really cold weather the signal points on the tracks can freeze and if they stick the signals will stay red meaning the trains cannot go anywhere. Also, if there is a rail on the top for power, if that freezes then there will be no power.
The other day Greater Anglia were saying they were putting socks over the horns at the front of the train because if the horn freezes it won't work and that would mean the train would not be able to go faster than 20mph.
Network Rail is also using a helicopter fitted with thermal imaging equipment to locate the worst points.
BBC Wales News
A total of 234 schools in Wales have closed due to the snow.
All of the schools are in the northern counties of Anglesey, Gwynedd, Conwy, Denbighshire and Flintshire.
In the links below you can see the details for school closures in each area: