That link gives the clearest timeline I’ve seen Callistemon, thanks.
Maddyone is correct in pointing out lockdown was a significant factor, Arthur was talking to staff in both his schools, plus his deteriorating physical and emotional state would have been obvious to staff, not to mention injuries.
Hughes had sought help from his GP, attended CAMHS with Arthur.
Set that against concerns from his maternal and paternal families. The police sergeant took no further action after the photographs were sent to children’s services. He believed there to be an ongoing investigation. Why the cursory visit wasn’t followed by interviewing family members, Hughes and Tustin again, seeing Arthur alone and getting a medical opinion on the photograph, plus paediatric assessment of Arthur will no doubt be covered in the review