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
Winter set for first bite as ‘Icelandic anticyclone’ hits Britain with sub-zero tempretures
Scotland and northern England will feel the first shiver
Sudden Stratospheric Warming to spark 'polar vortex collapse' amid fears of 'unusual' phenomenon
Meteorologists have issued early hints that a white Christmas could be in store
