Flight schedules in the UK have been hit by weather disruption, with London Heathrow Airport forced to cut one in ten flights today.
Following a joint decision by Heathrow, airlines and air traffic control, the flight schedule at Heathrow was be reduced in order to minimise the expected disruption.
The flight schedule for today has been cut by ten per cent to allow for more space to be left between aircraft in poor visibility.
Many airports have plenty of spare runway capacity so aircraft can be spaced out more during low visibility without causing delays and cancellations.
Because Heathrow operates at almost full capacity, there is simply no room to reschedule the delayed flights.
On the railways, Virgin Trains, Gatwick Express and Eurostar are all running a revised service.
Eurostar cancelled several early morning trains to Paris and Brussels and some afternoon arrivals.
Tickets for travel can be changed to another date, Eurostar said.
London City Airport has now re-opened at after ice was removed from the runway earlier.
However, Robin Hood Airport near Doncaster is closed.
Birmingham Airport has also been affected, with about a dozen departures and nine arrivals cancelled and delays reported.
East Midlands Airport runway is closed and flights have been cancelled or delayed.
Gatwick Airport said it would operate as normal, although it warned passengers of some delays to flights.