As the legendary broadcaster’s new documentary about living with Alzheimer’s is released, director Laura Warner tells Andrea Thompson what she learned from filming him and his wife, Patience – and why his story challenges assumptions about the condition S tanding alongside award-winning journalist Jon Snow this week at Bafta as the crowd gave him a standing ovation, I was overcome with emotion. We were there for the screening of my new documentary – Jon Snow : A Last Big Story , documenting his