TV tonight: Jon Snow defies Alzheimer’s in the most moving way imaginable

A Last Big Story is a stirring exploration of the journalist’s condition and his news instincts. Plus, a wholesome telling of the story of Indigenous Australian tennis legend Evonne Goolagong. Here’s what to watch this evening

8pm, Channel 4
This documentary starts out as a meditation on the Channel 4 newsreader’s Alzheimer’s diagnosis – but the journalist in him hasn’t departed quite yet. While Jon and his wife Precious are on holiday in Victoria Falls, he stumbles upon a mining disaster that has had almost no coverage in the media. His determination to get the tragedy into the news is stirring and very moving. Phil Harrison