Was reading this just now;
www.theguardian.com/law/2014/dec/01/109-women-prosecuted-false-rape-allegations
Two things jump out. One that there is no rule restricting the police from treating someone making an accusation as a suspect in a different crime, relating to the same circumstances, of perverting the course of justice, which obviously has the implication referred to in the article, that the rape claim will not be properly investigated as it is already being treated as the basis for a different investigation.
The second that how in the hell are police so frequently 'proving' that the woman has made a false accusation? I mean we are always being told that rape prosecutions fail because of a lack of evidence sufficient to prove beyond a reasonable doubt a rape took place, how are police finding sufficient evidence to prove beyond a reasonable doubt that someone has not raped someone AND that they went to a police station and deliberately made an unambiguously false complaint knowing and understanding what they were doing?!