On Air Now
Ellie Taylor & Anna Whitehouse 10pm - 1am
The Mayor welcomes more than 600 future international leaders to London later for the One Young World Summit.
It's happening at Old Billingsgate and over the next 2 days the group - all under 25 - will discuss their role in shaping the planet's future.
Sir Bob Geldof and former UN secretary general Kofi Annan are set to speak.