BRITAIN has braced for the worst snowfall in decades.
A blanket of snow will cover the country with up to 30cm falling on higher ground, amid fears the latest bout of wintry weather will bring the transport network to its knees.
Temperatures are expected to remain below zero in large parts of the country on what is predicted to be a particularly "messy" day for travel.
Blizzards and strong winds are set to make conditions treacherous on the roads and motorists were warned heavy snow would arrive before the morning rush hour.
South West Trains has already announced changes to its services and will be operating a revised timetable on a number of routes tomorrow.
The warning came as police said a pensioner who was found dead in the street near his home may have collapsed while clearing snow from his driveway.
Graham Clark, who was in his 70s, was found with serious head injuries in the village of Buxhall, Suffolk, on Tuesday.
The arctic conditions are expected to set in overnight, hitting Wales and the south west before pushing across the rest of the UK.
Laura Caldwell, a forecaster for MeteoGroup, the weather division of the Press Association, said 10-15cm is predicted to fall quite widely.
"Parts of the West Country, Wales, the West Midlands and central and southern England are going to get quite a bit of snow tomorrow," she said.
"That snow will carry on, pushing north and east so it will cover all of England by the end of the day and even parts of southern Scotland."
While Wales and the Midlands are expected to see the worst of the snow, London and East Anglia are likely have accumulations of around 10cm.
Ms Caldwell added: "It's going to inevitably cause disruption on the roads and railways. It's going to be a bit of a messy day for travel."