I've been to the Peak District to film a really enjoyable story. It's about a man called Will Roberts who a year ago was overweight, out of shape and a heavy drinker. But watching his mum suffer from debilitating multiple sclerosis made him determined to get up off the sofa. In that short space of time he's become running obsessed. Now he's about to take part in the 150 mile Ice Ultra race in the sub-zero temperatures of arctic Sweden to raise funds for the MS Society.