Seems odd to me that they are seeking charging advice which to me means they have a case but not sure if it’s enough to convict on... at least we should have a clear picture and know what is happening shortly!
It means they think they do have enough. The police don’t actually prosecute in this country it’s the CPS, who in general can do one of four things
Agree with police and tell A&S to charge
Suggest charge on a lesser offence to try and increase chances of a conviction (not sure if relevant in this case)
Disagree that A&S have a strong case and suggest release with NFA
Suggest prosecution is not in the publics interest and release NFA