In a special edition of 'Tonight', Adam Holloway goes undercover to investigate the rise of street homelessness in Britain, which is now in its seventh consecutive year of increase. Nearly 30 years after he filmed life with rough sleepers for a groundbreaking ITV documentary, Adam, who is now an MP, returns to where the problem is still most acute - on the streets and in the homeless shelters of the capital - and sets out to discover why rough sleeping persists three decades on.