Been there, seen that. The police are a law unto themselves when it comes to football.
I hate away days with large police presence, they cause as much trouble as they stop.
When they tell you what to do, you do it or you get arrested. Even politely put sensible questions get met with "f**k off or i'll set my dog on you"
Last season coming out of the ground at an away match I got directed by the police right towards a baying mob of home fans. I legged it and luckily was safe but one pensioner got hit with a brick, a mate got a kicking and a couple more got threatened with broken glass bottles.