I may have missed this as so much to read through, but is it known how/why the school was alerted and then called PA re Willow and NB's fone? Would the phone have been locked by this time? Did someone at the scene (eg a parent from the school) recognize Willow and know NB from the school gate? Is the time of this call from the school to PA public knowledge?
Quote from Ch5 interview transcription
"Paul - Yeah, lunchtime, go to the gym. We're (or were?? were is typical of Yorkshire accent, not Lancashire), going to leave, and then the phone rang and it was the school, and it was the receptionist at school and she said 'Mr. Ansell, it's a bit of a weird one, but we've found Willow and Nikki's phone on the bench and the harness halfway down the embankment on the floor."