Heavy fog in UK, flight operations affected

Many areas of the UK are covered in heavy fog, flight operations at major airports are also affected. According to British media, flights at Gatwick, Heathrow and Manchester are being delayed due to fog.Airports have also warned of more flight cancellations and delays, the media claimed.Many flights departing from Gatwick today were delayed by one to three hours.British media say passengers are advised to contact their airlines before travel, with airports warning of further flight cancellations and delays.