Heathrow Airport has announced its flight schedule tomorrow will be reduced by 10%, the equivalent to 130 flights.
It said the decision was taken to minimise expected disruption caused by low visibility, which forecasts show is highly probable.
Details of which flights will be cancelled will be announced by airlines when they have finalised their schedules.
Passengers due to fly were urged to check the status of their flight with their airline before travelling to the airport.
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A milder night across the north than last night, with rain sneaking into southern Scotland from Northern Ireland.