Thermometers are about to plunge amid predictions of crippling snowstorms and major whiteouts lasting into February. Experts warn to expect a very “exciting” December even hinting at the possibility of a White Christmas this year. After several mild and wet winters 2016 will buck the trend with the UK now facing the coldest and snowiest for at least six years. Britons are warned not to be lulled into a false sense of security by the unusually hot September weather and the mild autumn so far. A dramatic swing towards colder conditions will see temperatures plummet across the country as freezing air sweeps in from the Polar regions.