The predicted blast of Siberian weather has gripped Britain, and forecasters say we’re potentially facing the lowest temperatures for 25 years. Freezing temperatures and heavy snow have been taking their toll, with chaos on the roads, thousands of school closures, disrupted trains and flights, and even troops called out to help. In Snowstorm: Britain's Big Chill on ITV at 7.30pm, Helen Skelton investigates how the ‘Beast from the East’ is affecting Britain, and why the weather is still catching us out.