My experience with NHS has been absolutely wonderful to date--really top-notch care. Don't know why they're making such a rigmarole out of this.
If it is anything like publicly funded detox centers in Sweden, they will raise the bar for getting "accepted" as they run out of funding. I had an ex-boyfriend who was in a similar situation -- he couldn't keep the information they needed in order to determine whether he fulfilled the qualifications to get admitted. He made a half-hearted suicide attempt, and that got him into a mental health facility from which he got funneled into drug rehab.
I'm really sorry he's having such a hard time getting the help now that he's decided he wants it.