A spokeswoman for Britain's busiest airport said the weather had forced the cancellation of about 50 flights on Sunday. “We've had to cancel flights to … | more… https://www.google.com/url?rct=j&sa=t&url=http://www.theguardian.com/uk-news/2015/nov/01/heathrow-cancels-flights-fog-airport-half-term&ct=ga&cd=CAIyHDQxMjEzYTNjZmYwOWZjYzQ6Y28udWs6ZW46R0I&usg=AFQjCNERRTBNBn2aB_tyC061HeA6U4EXzQ