By Susie Beever Brits can look forward to a fresh blast of wintry weather later this month as a wall of snow the length of the UK looks set to sweep the country. Weather maps show the country shrouded in a shade of blue and purple, meaning snow could be on the way. Forecasters have already hinted at the possibility of a fall of the white stuff later this month as temperatures plummet. The WXCharts map shows a 647-mile-long band of snow from the Orkney Islands all the way across Scotland and down the North West as far as Cardiff for Tuesday, February 27. The snow is set to be particularly heavy…