It takes a long time to leave certain relationships, I'm not surprised you've taken a long time OP but it's encouraging that you have repeatedly posted, which proves you're on the case. Not sure why you have to post under the same name, or what's wrong with asking for the same advice over and over - imo it is all part of the process. I've started going to the Freedom Programme - fantastic, recommended for you nameme and anyone who is in an abusive relationship or has a history of abusive relationships. I met a woman there who told me she has been doing the programme for 2 years! It is a 12-week programme but she's been on a rolling attendance. She has only recently moved out of the marital bedroom and into the annexe - it's taken her two years to get to that stage, it's taken that long for it to sink in, for it to un-brainwash her - which imo shows the power of these relationships to destroy the target of the abuse. She says she will leave her marriage but I suspect it may not be for a while yet - no matter, she has come this far and made huge strides. You also say OP that you have been sexually abused in the past and, I take it (given your history with men), have repeatedly fallen into the same trap of abusive relationships. So in the light of that, congratulations on making significant steps in your life, getting through an access course (hard work! I've done one!) and setting up your future on a uni course and also somewhere to live. Bravo OP, stirling stuff 
. Good luck with your uni interview in March.
As for the girl, well, it all looks a bit strange to me. If he is an abuser (? I don't know but I assume so from your OP) then ALL his relationships will be severely dysfunctional. The way he has actively estranged his daughter from her mother, from what you say; the bed-wetting, the hygiene... all could point to a very unhealthy environment for the daughter. As for incest, it can be totally 'silent' and leave no trace whatsoever - it runs on stealth, as I'm sure you can attest to 
. Have you rung the other number someone posted yet? Not the NSPCC, which you tried before - well done for having the courage, not surprised you didn't feel you could take the big step of calling SS at that stage. Hopefully calling the fresh number will clarify things for you and, hopefully, it won't be too long before you feel you can alert the authorities, as imo it is better to be safe than sorry and, also imo, even if he is not sexually abusing her, the relationship seems emotionally unhealthy. The school seem to be a good place to start - can you speak to them instead of writing? If she has a problem with hygiene and has smelt of wee then my guess is that she is already on their radar. Does the mother have a relationship with the school, does she have PR?
From what people have said on this thread, although you have had some good support, you have also taken some nasty flak on here too OP but you have kept going and kept posting - hats off to you. I don't think people 'get' the nature of these relationships, how hard they are to get out of. Well done all round, you're nearly there.
PS Please take a look at the Freedom Programme and see where there is a course near you. As well as first-rate teaching about the pathology of abusers (and abused) it is also a support group, so you won't have to grab support where you can get it, ducking and diving, it'll be on hand and everyone there will fully support and understand what you are trying to achieve and cheer you on your journey to FREEDOM