By Bradley Jolly This startling weather map shows all of the UK is to enjoy balmy conditions in less than a week – as temperatures rise by nearly 10C. Snow fell across parts of northern England and Scotland on Thursday as the mercury plunged this week – to as low as -4.9C on Wednesday in Braemer, Aberdeenshire. But new weather maps, produced by forecasters at Metdesk, show a radiant band of high pressure to move across the country from the west. Temperatures will rocket back up – and are expected to reach 14C by Wednesday February 14 across the south of the nation, less than one week after the…