I watched it & as an ex-child protection social worker I have a few comments, the young boy in school at no point was seen by a social worker and this is the bread & butter of child protection, I used to protect the child from the ire of the school, ie being moved to SEND maybe by taking time off & ask a youth worker to see him along with myself then you can really get alongside him & find out what is going on then get him appropriate care, ie CAMHS & child protection police involvement. Many times they can go back to school knowing someone is working with mum & planning care.
Also I felt those looking after the abuser were very stoney and tense, whilst you don't want to minimise the crime there is a middle path to be trodden by supporting the person but not the crime.
Also, the type of sexual abuse in social services is usually way more than that, I guess the BBC were cautious in how much they featured.
But well done Jimmy McGovern for writing it & the Beeb for showing it.
Just next time get the roles of the professionals right, I don't think a psychologist would withhold an allegation like that anymore, that used to be the case but now they're much more likely to tell the child that they are bound to pass such information on & help them see this is helpful not a hinderance