Why do they need a police investigation when they can get the prosecution launched without it? the raw data in the investigation report and the evidentiary material on which it is based can form the basis of the brief to the DPP then what does a police investigation achieve.
Also Bernadette O"Neil was acting under advice from the Solicitor General when she did not hand over the material.
Because they are investigating different issues. Also, fwa used the "we can't cooperate with the police while investigating Thomson" under advice from their lawyers ... Which was wrong as there was special provisions for the head of fwa to do so.
Edit : and also to clear Kathy Jacksons name, as FWA are clearly being obtuse regarding how many of the findings relate to the individuals themselves.