Severe fog could scupper pre-Christmas travel plans today, with threats of flight cancellations and train delays.
Freezing fog is forecast overnight across some eastern parts of Wales and southern and central England. It is expected to last until midday on Tuesday.
British Airways has already warned customers booked onto short-haul flights that it has had to cancel some departures.
A statement on its website reads: "If you are due to fly to or from European destinations on Tuesday, you may choose to change your travel plans and rebook onto alternative flights up until Friday 22 December."
A yellow weather warning is in place for the East Midlands, the east of England, London and the South East, northwest England, southwest England, Wales and the West Midlands.
Visibility may drop below 100m in some places, the Met Office has warned.
It said: "Slower journey times are likely with delays possible to bus and train services. Some delays or cancellations to flights are also possible."
Travellers hoping to fly in or out of the UK are advised to check before they make their way to an airport.
On Monday, all flights were temporarily suspended at Manchester Airport due to heavy fog and a "minor defect" on a runway.
source: SKYNEWS
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