Met Office issues yellow weather alert for fog as Britons warned of travel delays
Britons travelling abroad are being urged to check for flight delays or cancellations
'Dangerous' winter deluge to dump half a foot of snow as Britain freezes in Arctic snap
Delays on roads and travel networks are expected
UK weather: Cold alerts issued for 5 major regions as mercury to plunge 'as low as -7°C'
Yellow warnings included a risk a 'rise in deaths' according to the UK Health Security Agency and Met Office
