Temperatures look set to plummet to as low as -10C next week as Britons brace for snow and heavy rain, new weather maps have shown. WXCHARTS predicted mercury to fall below freezing and snow to hit parts of the UK. Temperatures could fall to as low as -10C in Scotland on the morning of April 3. The entirety of the UK will witness mercury drop below freezing the following day, with lows of -4C in Wales, -6C in Scotland and -6C in northern England. WXCHARTS has also suggested snow will fall across Scotland, north Wales and parts of the north of England. Snow will hit southern England by April 7,…