Funnily enough, there was a Reddit post from 7 months ago saying that the reason Brand had done a political shift and started courting the right was because he wanted support when the allegations started coming out.
Kind of surprised at "Why didn't they go to the police?", or "Why haven't the police done anything?" comments. Ian Watkins (former singer of thelostprophets, paedophile) was reported to the police multiple times for his inclinations by his ex, over four years, and they did... nothing.
They accused his ex of being a bitter ex targeting a famous man. They then charged her with possessing child abuse images, which she'd been gathering as evidence to try and get the police to believe her. She was eventually cleared, and he plead guilty to the attempted rape of a baby. But everyone knew his reputation, there were loads of posts on music boards about how young female fans should be kept away from him, as he liked to invite 13/14 year olds backstage to abuse them.
So yeah, I'm entirely unsurprised by the lack of police involvement.