The NSPCC has published a factsheet pulling together the most up-to-date statistics on children who are the subject of a child protection plan in England. The factsheet sets out: the number of children who are the subject of a child protection plan; the reasons children are the subject of a plan; and the age and gender of children who are the subject of a plan.
https://learning.nspcc.org.uk/media/1181/child-protection-register-statistics-england.pdf