“However, it is most important when deciding whether the parties at an inquiry have had a fair opportunity to comment on an issue raised by an Inspector of his or her own motion, and whether they could reasonably have anticipated that an issue had to be addressed because it might be raised by an Inspector, to bear in mind the highly focused nature of the modern public inquiry where the whole emphasis of the Rules and procedural guidance contained in Circulars is to encourage the parties to focus their evidence and submissions on those matters that are in dispute.”