Every year a group of politically-conscious teens from south London signs up to be part of the Advocacy Academy. Aged between 17 and 18 years old, many of them too young to vote, the successful candidates embark on an intensive six - month programme to become young leaders in their communities and run a grassroots campaign on something that matters to them. From sexual harassment to affordable housing and Islamophobia, some of this year's advocates told us about the issues they're fighting to change.