I think the club would have to foot the policing bill, that's what usually happens if they need more policing iirc
Inside the ground, yes. They aint stupid. Standing (yes even safe standing) at football would increase trouble inside and out of the grounds. Especially in the top flight. Thats my view. It would make games more heated, more passionate. Plus it would be even easier for the ticket counterfeiters. Even more fake tickets at top flight games. At the moment its mainly limited to when the likes of Man United/Spurs/Liverpool are away (ie guaranteed everyone standing up, all game). If standing came back to home ends, with prices as they are, the amount of forged tickets would go through the roof. That means greatly reduced security.
Just between you and me. I want standing back as much as anyone. But Im not kidding myself.