Mark Lewis is the high-profile lawyer who famously helped 180 victims of phone hacking to victory in the High Court.

But for half his life, the 50-year-old has also been battling multiple sclerosis. In this emotionally charged film, Mark allows cameras to follow him as he becomes Patient 31 in a clinical trial at Jerusalem’s Hadassah University Medical Center.

Nothing happens quickly in medical science, but if a breakthrough can be made it would not only help Mark and the estimated 2.5 million MS sufferers around the world, but could also be good news for people with Alzheimer’s and Parkinson’s.