Icy conditions have caused travel disruption to some parts of the country following snowfall across the UK.
The worst-affected area was north-west England, where flights and rail services have been hit by delays and cancellations.
The Met Office has issued a fresh yellow warning for ice which will come into force at 18:00 GMT on Wednesday.
Motorists have been warned to take extra care because of hazardous driving conditions.
Forecasters said some parts of the country could expect further wintry showers later in the day.
The runway at Liverpool Airport has been closed due to icy conditions, causing some flights to be delayed. Passengers are being advised to call their airline before travelling.
Passengers using Manchester Airport are also facing delays because of thick freezing fog, while two flights have been cancelled.
The airport said the number of landings and take-offs has been reduced, meaning flights are being delayed by 20 minutes on average.
Merseyrail said there was severe disruption to its services caused by ice preventing electricity from reaching the trains.
And Greater Anglia Rail advised customers that trains between Hackney Downs and Cambridge may be cancelled or delayed.
Icy conditions have also caused a number of incidents on motorways in the North West, with the M61, M53 and M6 all affected.
In Wales, Dyfed Powys Police said it had received “several reports” of crashes due to ice while North Wales Police said snow was causing “treacherous” conditions.
There was a serious crash in Neath Port Talbot and a 10-car crash in Swansea on Wednesday morning.