Severe fog has forced the cancellation of dozens of flights
scheduled to take-off and land at Britain's airports on
Wednesday with more disruption expected later in the day.
Flights to Warsaw, Nice, Stockholm, Aberdeen and several German
cities were among 20 cancelled by London's Heathrow.  "It's
better to cancel flights when there's fog because in fog you
can't land as many planes per hour because you have to leave
more space between the planes," said a spokesman for the
airport.  The smaller London City Airport also reported
disruption.  A message on the airport's Twitter page said:
"Visibility has not improved, flight disruptions are present and
expected to continue until further notice. Please call your
airline for info."  Britain is in the middle of a cold snap with
temperatures hitting minus 10C (14F) in some parts of the
country.  "The fog is currently pretty widespread," explained
Julian Mayes, forecaster for MeteoGroup.  "It's currently
located over central England as a large area of low cloud, whic