London Marathon gets underway

Over 40,000 runners are taking part in this year's London Marathon, tackling the course of just over 26 miles (42km). Many of the fastest runners in history are featuring, including Great Britain's Mo Farah, who has announced this will be his last-ever marathon.

Also in the programme: Two black female authors, American writer Toya Wolfe and British writer Jade LB, discuss their work featuring the experiences of black teenage girls in the US and UK.

And an amazing story about music and friendship, which has its origins in war. It concerns two men - Ali Esmahilzada, a famous musician who had fled his native Afghanistan and Latif Nasser, an American radio producer - with a violin at the heart of the story.

Joining Julian Worricker to discuss these and other stories are Katja Hoyer, a German-British historian and writer and Visiting Research Fellow at King’s College London and a Fellow of the Royal Historical Society, and David Patrikarakos, a British journalist and author, and foreign correspondent for UnHeard, a British online magazine.

(Picture: A participant ahead of the London Marathon on Sunday, 23 April. Credit: REUTERS/Peter Cziborra)