Lewberry pie
Striker
I understand that, my point is if you can't prove conspiracy then you can't prove rape.Part of this is down to what the CPS thinks they've got a good chance of convicting on if they take it to trial. If they felt there was enough detail on the alleged conspiracy such as the texts making it clear they had planned to trap a woman like this, they'd have gone for it. If not, they risk going into court with charges that the defence can cast doubt on and potentially reflect doubt on the rest of their case. I'd guess that the prosecution didn't think they had enough cast iron evidence of a conspiracy or accomplice charge.
This decision process can be a bugbear for victims of crime but the CPS conviction rate on rape cases is around 60% and compares favourably to rates for other serious offences.