Britons were urged to wear hats and slippers indoors today as millions endured a sub-zero return to work and school in heavy snow - with union bosses urging businesses to let staff work from home. Some schools closed while roads were left impassable as vehicles were abandoned and railway lines became blocked amid warnings of up to 30cm (1ft) of snow. As many people went back to school or work after the Christmas and New Year period, a string of snow and ice warnings were in place across the UK for today. #snow #ukweather #uksnow