Here's the thing. If Warren publicly stated that he knew who it was, there's no way that the Police wouldn't follow that up. If he didn't tell them, they would prosecute him for perverting the course of Justice. CPS and the Police don't go much on this "Honour amongst thieves" business.
So I don't think he did "keep his mouth shut." I think he told the Police everything he knew, they followed it up , but they couldn't get enough evidence to get a successful prosecution.
That Doesn't necessarily mean Terry Marsh, it could be someone else who they didn't have enough on to make it stick. (being very careful not to be libellous here!)
So , in a Nutshell, Frank Warren knows who it was, (or thinks he does) the Police know who it was, but can't make it stick. The case is probably closed and they're not looking for anyone else.
That's my theory anyway!
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