A new documentary, 'Jon Snow: A Last Big Story', follows the former Channel 4 presenter as he navigates life with dementia and his participation in a key clinical trial run by UCL and UCLH. Jon is best known for presenting Channel 4 News between 1989 and 2021. He decided to open up about his Alzheimer’s diagnosis to raise awareness of dementia, which is the UK’s biggest killer and affects around a million people in the UK alone. In the documentary, viewers see Jon coming out of retirement for