Downton Abbey actress highlights plight of Syria's refugee children

The horror of Syria's four-year conflict has created the worst refugee crisis in two decades, with more than one million Syrians fleeing to Lebanon.

One third of them are children, almost all of whom are unable to attend school, making them vulnerable to child labour or radicalisation.

A campaign that urges world leaders to back a fund ensuring refugee children have access to education is being backed by Downton Abbey actress Laura Carmichael, who is a World at School Ambassador.

She told the BBC how she got involved in the campaign after meeting World at School co-founder Sarah Brown, and her experiences of visiting those who were living in terrible conditions in the Bekaa Valley.