Over 300,000 children were excluded from school in England and Wales last year - almost 6 thousand of them permanently. Many of these children will end up in "alternative provision", sometimes known as pupil referral units (PRUs) - schools for kids that the mainstream can't handle. But five years on from the Taylor Review, a report that found 'a flawed system' that failed to provide good education and accountability for 'some of the most vulnerable children in the country' - has anything really changed? File on 4 hears allegations of a system under pressure; of illegal exclusions, 'missing kids' and how some schools are controversially manipulating league tables through 'managed moves'. We also hear from whistle-blowers from one school who claim an overburdened system and a rise of referrals of kids with extreme and complex needs have led to an increase in the use of physical restraint to manage escalating violent behaviour in classrooms." Reporter: Adrian Goldberg Producer: Alys Harte.