what Green did in the days before the cops had their attention drawn to his devious behaviour...

No devious behaviour was uncovered.
It is not devious to look at legal porn, which he denies anyway.

The police behaviour could be described as devious.
Labour's Keir Starmer, then the Director of Public Prosecutions, found that the accusations against him were false. The leaks did not expose any secret information (unlike Bob Quick's) and did not involve national security (unlike Quick's incompetence.)
There was no justification for the raids on Green's offices and his home. He should never have been imprisoned or even questioned.
Deviant police behaviour.