People Smuggling. Human cargo is big business - the UN estimates such trafficking generates L7 billion a year. This second of four films traces some of the smuggling routes into Europe and hears from the people using them about the dangers experienced along the way. It also looks at how the UK Immigration Service is targeting the "back door" to Europe to stop migrants heading to Britain. Series producer David Russell ; Executive producer Edwina Vardey A quartet of programmes on the asylum issue begins with Kilroy tomorrow at 9am