The Mayor is under fresh pressure to look at care services in London.
It comes after he was criticised for not doing enough about the number of children who go missing each year. Conservative London Assembly chair Andrew Boff says the reasons why children run away are not just down to geographical reasons.
Latest figures show more than 900 children in care - simply 'disappeared' for more than 24 hours last year.
In the wake of the abuse scandal in Rotherham - it's feared some of the children who are still missing may be suffering abuse. Natasha Finlayson from the Who Cares? Trust says that councils need to act earlier.
Joining the Headline London debate is Natasha Finlayson from Who Care? Trust and Conservative London Assembly chair Andrew Boff.