The more I re watch and think about it the less clear it becomes.
I've been trying to determine who within the force is working for the criminal gang.
There is the "2 faced bastard" that Tommy Hunter referred to who would be at the top of the chain as well as other less powerful "soldiers" .
Originally I suspected Buckells of being involved but he is at odds with Roz and said he doubted Farmer's guilt .
This doesn't mean he isn't involved at all but doesn't appear to be in on the frame job.
Hilton seems too obvious to be the "2 faced bastard" - I think he's despicable but not necessarily criminal.
It would have to be someone very powerful within the force. Who else have we seen that might fit the bill?
We've never seen Hilton's boss the Chief Constable have we?
There was Steve's old boss in series 1 when he was at counter terrorism,we haven't seen him since.
I hope it's someone that we know already.