How can someone make a complaint confidentially regarding abuse by a social worker?
He would have to go to the police. Whether the acts were committed by a social worker or someone in another profession is not the main point here. The fact is that a criminal act or acts have taken place, and this needs to be reported to the police. If this goes to court then the fact that the person is a social worker and abused a position of trust will be taken into account during sentencing. However, it is possible to make a complaint against a social worker without going to the police. The local council or citizens advice bureau would probably be the best place to start, as there will be a formal system for making complaints. However, despite the fact that he has no physical evidence, I would advise that he go to the police in the first instance, as what has happened is a criminal act and the police have the correct procedures for dealing with it.