Vietnamese children forced into slave labour in UK's clandestine cannabis plantations
Vietnamese boys and young men forced to commit crimes by cultivating drugs in clandestine plantations controlled by ruthless traffickers
UK criminal defence lawyer Philippa Southwell points to the thick ring binders that line her desk in a small office above a bookie's and fast food joint in south London.
More folders are neatly stacked on the floor, in a bookcase and a metal filing cabinet, a hint of her growing caseload.
In recent years, Southwell has specialised in representing a particular kind of client: the young men and boys who are trafficked to Britain from Vietnam to labour on illegal marijuana farms.
Often from poor families, many regard the West as a gateway to prosperity. Others leave weighed down by a duty to provide for parents, brothers and sisters back home.
The Home Office estimates there were up to 13,000 victims of slavery in Britain in 2013. Victims are most often from Albania, Nigeria, Vietnam and Romania.
Many of the Vietnamese are children when they set off, travelling thousands of kilometres by foot, boat and lorry over months, sometimes even years, before reaching British shores.