Op I'm working so my replies may be sporadic.
Have they submitted a child concern form ? Did you ask them ?
Do you have the incident number ?
If I were you I would now ring 101 back and ask to speak to the duty Sgt. Get the names of the attending officer (s) and ask the duty Sgt what the rational for leaving him there was . Stress to the Sgt that you know this relationship was going in before he turned 16 as he referred to her as his girlfriend. Ask if he minds giving you his name and collar number just
For reference.
Say the words - child sexual exploitation- tell him you suspect she was grooming him before he was 16 .
I would ask for confirmation of her age and if they admitted the relationship is not platonic.
Be really calm - but be assertive. Ask directly what their rational is if they are not treating this as a child concern and possible CSE .
Did they speak with him alone or with her present ?
If you get no where with this ask for the duty inspector. Ask the same questions of him - and also nicely ask for his name and collar number .
They may say that if you wish to raise a complaint then you may have to speak to the Sgt of the officers who attended .
If you get no reassurance from the duty Sgt or duty inspector, call 101 back and say you would like to raise a complaint in respect of inc no xxx . They will create a new incident "complaint against police " - this will go back on the active queue - in fact scrap my above advice and do this first - that way a duty Sgt should call you - they may not be the same group who attended so he will likely refer it to the attending officers Sgt - but then at least you have a new incident number in relation to the complaint.
You need to write a list of questions for that Sgt when he contacts you - and ask when he is back on duty .
Sorry this is garbled but I'm working - when you've raised this as a complaint get back to me .
And don't t worry about complaining- it will just be a means to create a new incident to get some answers.
You need to write a list
If questions and ask them .
Write down the answers and get the details of anyone you speak to .
When I know what they've said and their rationale for leaving him there I can advise further .