Travellers face delays as fog disrupts some flights at UK airports
Thick fog has blanketed parts of the UK for several days, impacting travel at major airports
London's Heathrow and Gatwick airports are reporting delays for some flights that could continue throughout the day
Nats, the UK's main air traffic controller, says that temporary restrictions are in place in areas with "low visibility"
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Travellers face delays as fog disrupts some flights at UK airports