Forecasters are predicting temperatures to plummet as the UK is set to be pummelled by a Polar ice blast. WXCharts is temperatures will plunge to an icy -8C in central Scotland at around lunchtime next Thursday, January 18. Temperatures are set to fall below 0C as far south as Cardiff and north London. It is set to be -5C in Manchester, -4C in Newcastle and 0C in Birmingham. Brits are being advised to wrap up warm and take care underfoot when temperatures stay below freezing for an extended period of time. A spokesperson from the Met Office: “By the middle of next week, the wind should ease an…