1. It is estimated that over 92 000 young people in the UK were being looked after by the state in 2013 (National Society for Prevention of Cruelty to Children 2014). ‘Looked after’ young people are more likely to be convicted of a crime and be sentenced to custody than other children (Blades 2011), and also have high rates of mental health problems (McCann 1996; Meltzer 2003).