Rape is a quite singular, abhorrent crime. But it is a difficult one, something I have spoke of before and will no doubt speak of again. Despite some pop cultural themes, rape seldom occurs in dark alleys or wind-swept parks. A woman is more likely to be raped by someone she knows, a partner, ex-partner or 'friend' or some kind.
That said, there is a link between the accused and victim. This link can cloud cases and make them difficult to follow, and make prosecution even harder. A hypothetical case could go something like this, and forgive the simplicity for the moment: Jill accuses Jack of rape. Jack denies any rape occurred. Police investigate the surrounding case, interview people etc. and it turns out Jack and Jill were in a relationship at the time. Relationships are pretty private, so it is Jill's word set against Jack's.
I feel for Inspector Knacker, at this point. Rape is not a clear cut crime, like theft or assault, for example. If Jill accused Jack of stealing some material goods, and he denied such theft, the police finding such goods in Jack's house would count as evidence. There is no such clear cut evidence for rape. If Jack and Jill were in a relationship at the time, much vaunted DNA evidence is pretty moot. Although bruising and other injuries could count as something more of a smoking gun (bruising on the wrists, for example, insinuating some sort of forced holding/restraint), some of these injuries are not clear cut proof, either. Vaginal tearing, for example, can occur during consensual sex, too.
This paints a grim picture of any possible rape prosecution. I support the idea of placing more emphasis on solving cases of rape, and specialist squads are not a terrible idea. Some organisations blame Inspector Knacker for not taking rape seriously. These squads/teams could help reinstall a little faith in the system, and encourage more rape victims to come forward. But I can't help feel this is yet another policy in a long list of ideas which are never fully funded, followed up and backed up. Which is a damned shame.
Edit: Mark Easton makes some great points here, including statistics. He ends on the idea that policing alone can't change conviction rates and even attitudes towards rape, and I couldn't agree with him more. Considering rape within marriage was only made into a crime recently, the country - not just Inspector Knacker - should be ashamed of itself.
Edit ii: Interestingly enough, Mark Easton points out that rape is counted as:
"the penetration of the vagina or anus without consent and penetration of the mouth by a penis without consent."
Why rape against males still doesn't exist in a legal concept, I have no idea in that respect.