So just to clarify, you appealed to London Tribunals, they refused to process the appeal as you did not send authorisation from the Registered Keeper to do so. Have you then started a new case or submitted additional evidence?
This would be more useful if we have a list of dates - "NoR issues X, Tribunal case started Y, contacted Z, replied ZZ" etc. If there was some sort of hearing on the second, this might just be a procedural one to decide if your case evidence supported allowing you to represent the RK, it could be any number of things.
Have London Tribunals confirmed the case is still open?