Crispy, I rarely post and I haven't read the full thread, but I just thought it might help if I share what happened to me in February.
Without going into details I was woke up in a hotel room on a Sat morning with no idea how I had got there. I'd been for dinner at a posh restaurant with some friends - a married couple - left them to go to the tube and then it is all a blank. I spent 5 days in a state of bewilderment, unable to process things. It was awful, I felt like I'd gone mad.....and then I found a tampon which had been inside me since that night (sorry if tmi). Then I knew I had to do something. I went to the police, totally unable to explain what had happened and they have, at every step of the way, taken me seriously, investigated, interviewed, got CCTV evidence etc. At no point did anyone suggest that I was making it up, or even suggest that I was drunk, which, for the record I wasn't, not that that would give anyone the right to take me to a hotel and rape me iykwim.
I also live in London and the Haven were BRILLIANT. No pressure to do anything with the tests, or judgement, or anything. Just lovely.
I suppose what I'm saying it...for me, it was a huge relief to admit and start to accept what had happened, and reporting it helped me to do that. It made me able to define it and start to separate it as something someone had done to me, rather than something I had brought on myself. It really clearly became someone elses's fault. I know everyone's experience is different and I certainly wouldn't advise you to do it if you don't feel able, but my experience of London police and the Haven in particular was great. I don't know what will come of the ongoing investigation, but for some reason that hasn't really felt like the point for me, and similarly, you can report, or go to the Haven and not proceed if that doesn't feel right for you. But at least you will have the option, whereas the longer you leave it to get checked out by them, you won't. After 5 days there was no DNA evidence for me.
Sorry for length!