A very quick search of the Horizon inquiry records led to a lawyer witness who testified that he didn’t follow the Code when he worked for a firm which did occasional private prosecutions on some matters relating to dogs, but once employed by the Post Office he did apply the Code to the cases he was considering prosecuting on their behalf.
In most railway cases, of course, applying the Code is irrelevant. There is a general public interest in prosecuting those guilty of crimes. Disputes over whether something should be a crime or not are seldom relevant so there’s rarely a public interest issue (in the sense meant in the Code) in deciding to prosecute someone who is undoubtedly guilty of a Bylaw offence. The issue in the Post Office is the wilful (institutional) ignoring of evidence which would undermine the prosecution and which, if disclosed, would make the likelihood of conviction much less.
In most railway cases, of course, applying the Code is irrelevant. There is a general public interest in prosecuting those guilty of crimes. Disputes over whether something should be a crime or not are seldom relevant so there’s rarely a public interest issue (in the sense meant in the Code) in deciding to prosecute someone who is undoubtedly guilty of a Bylaw offence. The issue in the Post Office is the wilful (institutional) ignoring of evidence which would undermine the prosecution and which, if disclosed, would make the likelihood of conviction much less.