Motorists have been warned of dangerous conditions and air travellers of potential disruption to flights after snow and ice struck parts of Britain.
Thousands of people were also left without power overnight, and the Met Office has warned of the risk of slips and falls on icy surfaces.
The southbound carriageway on the M1 was closed after a lorry crashed near Lutterworth, while another jack-knifed on the M5 near Gloucestershire in heavy snow.
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Services to Amsterdam, Munich and Paris are among those affected. Earlier this month, hundreds of BA flights to and from Heathrow were cancelled because of de-icing problems.
BA is telling travellers: “Sleet and possibly snow are forecast for the Heathrow area this morning so we are making some adjustments to our schedule.
“During cold weather conditions aircraft have to be de-iced prior to departure to ensure that they are safe and additional measures are taken to ensure the safety of our operation is maintained at all times.
"We ask customers to check the status of their flight before they come to the airport and we will do all we can to minimise the effect the weather has on our operations.
In addition, Eurowings has cancelled a round-trip from Hamburg to Heathrow.
London City airport has seen five diversions of arriving flights: two on KLM and Flybe, which went to Southend, and one on Alitalia that touched down at Gatwick.
Around 11,000 homes across the Midlands are still without power, reports the BBC. Engineers are having to deal with more than 200 faults across the network due to the snow and ice.
Dry, bright and breezy conditions will follow, with some wintry showers affecting the west and north of Wales and Northern Ireland.
Temperatures are expected to peak around 6C (43F) in the South West, although many places will only reach 3C (37F) or 4C (39F).
Places where snow has accumulated overnight will struggle to tip over 0C (32F), while those areas could see temperatures dip back down to minus 6C (21F) overnight on Wednesday.
Thursday will generally be drier and day with slightly less wind, although it will remain cold.
Wet and windy weather is expected to return for the weekend, raising the risk of some flooding.

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Birmingham Airport warned passengers flights could be affected by snow.
The Met Office has issued a yellow warning for ice across Northern Ireland, large parts of Scotland and the north-east coast of England.
A yellow warning over snow and rain was also triggered for the Midlands, London and the South East, the North West, South West and Yorkshire and the Humber. It will remain in place until 11am on Wednesday.
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