Correct me if I'm wrong, but surely the fact that they're legally not guilty means that this restricted evidence cannot be used to convict them and they cannot be found legally guilty off the back or sent to prison - right?
Double jeopardy in serious cases (including rape) was done away with in the UK inc NI. s75 Criminal Justice Act 2003.
There has to be sufficient evidence for that though, and AFAIK it has to be new evidence, so it depends what the restriction relates to. In theory, they could be re tried if there was some compelling evidence. But that is unlikely.