Re: "I've never encountered a case...one party has not known the identity of the other party."
"Hasn't he? He's never dealt with organised crime cases then?"
In those cases, the complainant would be The Crown. Individual witnesses may well be kept anonymous from the defendant and the public record, but will most certainly be known to the court and the prosecution. This guy is currently refusing to even tell the court who he is and the defendant needs to know who he his if they are to take any action in respect of his complaint.
Ps "There are some problems with your post. The title is too long." Looks the Re: took it over the limit.