It seems that some on this thread are saying that as teachers have a responsibility to be a role model, that is why you would not want them fraternising with a sex offender or violent criminal.
Tbh I would prefer it if nobody I came into contact with was living with a sex offender or violent criminal. If it shows poor judgement in teachers it shows poor judgement for every member of society. Therefore nobody should live with this type of person. In which case where does rehabilitation and serving time come in?
Teachers are role models, yes, but this legislation seems to be taking things way too far, as a pp said up thread, a conviction for assault years before you even met the person, how would you even know about that? Or will partners and housemates now be required to sign something? Would that even be allowed?
Obviously avoiding situations where grooming etc would be a realistic threat is sensible. Policing a teacher on the grounds of an historical and non related event is not.
Btw, I would be uncomfortable with the idea that my child's teacher was living with a violent criminal, and I would not knowingly associate with one. But I do think the boundaries are getting blurred.