A friend of mine went through something similar last year, and was on pre-charge bail for virtually 12 months. It's horrific, and completely wrong. It's also not supposed to be happening any more.
Anyway, it has nothing at all to do with your case. The CPS are just so incompetent that you file will probably just be sitting waiting to be reviewed, so don't take it as any sign of the strength/weakness of the case. Put the pressure on by contacting the officer in charge. Contact the head of the police force. They will ALL tell you it is the CPS and not them - don't accept that as a fob off. Be annoying as hell.
Having been there I do understand how it squishes your psychology up completely. But take a deep breath, remember that you are (no matter what anyone says) still legally an innocent person and it is incumbent on THEM to prove otherwise. And a YEAR??? A YEAR??? Totally wrong, cruel and necessary.
So, I would suggest, email the OIC politely once. Let them fob you off. THEN, reply and CC in the most senior Officer your can in your local force. You will be fobbed off again. Then Email all these fob offs back to OIC, copying in head of police, complaints people in the CPS, and your local MP. Remain entirely polite, of course, but make it clear you're going to be a pain in the ass until THEY move this forward. It is highly unlikely it is anything to do with the police, but they will get so sick of you they might start begging the CPS to sort it out!
Also, if you want, I can tell you more about the actual replies I got from my MP very recently with regards to the Pre-charge bail issue.