By Ewan Gleadow Almost all of Britain will be covered by a 688-mile snow bomb, with an exact date for the freeze confirmed. New weather maps indicate Britain’s weather will be closer to the frigid peaks of the Pyrenees in mid-March, with the country to be blanketed by a shock wave of snow. The massive snow bomb will be covered in snow early next month according to WXCharts. A weather system running from Snowdonia is believed to be behind the sudden icy surge. Members of the public may need to brace themselves for the snow bomb, which is set to cover parts of Scotland as well as most of Britain…