By Joel Day & Benedict Tetzlaff-Deas A mammoth 114 hours of snow could hit the UK soon thanks to a blast of polar air, according to new forecast maps. Projections from WXCharts show a dark purple formation signalling snow across a large stretch of the country on March 30. This includes a number of major cities and towns in northern England, the north of Wales, and central parts of Scotland. After the current mild spell saw Brits temperatures of around 15C in some places this week, the mercury now looks likely to plummet towards the end of the month as a harsh weather front descends from the no…