David Cameron on the Alzheimer's Breakthrough

The former prime minister says it’s his “happiest day” as president of Alzheimer’s Research UK, after the discovery of the first drug to slow the disease.

He also speaks about whether he did enough during his premiership to support those who needed dementia care.

And, the BBC’s health and science correspondent, James Gallagher, explains how the medication works.

This episode of Newscast was presented by James Cook and made by Tim Walklate with Miranda Slade, Madeleine Drury, Chris Flynn and Emma Jacobs. The technical producer was Emma Crowe and the assistant editor was Sam Bonham. The editor was Jonathan Aspinwall.