Britain in the snow is not a pretty sight. A dusting of an inch or two (or "2.5cm" as it is commonly known) will close schools and create newspaper headlines of "Britain's Arctic chill". Schools are closed and people wrap up like they are auditioning for 'Scott of the Antarctic'.
But add a few more inches to that (or many more millimeters) and we are talking serious chaos. The entire country comes to a standstill. Major airports are closed, roads are gridlocked, trains are cancelled and the stores are running out of supplies. There is not a pint of milk or a loaf of bread to be found on the supermarket shelves.