“It is also to be remembered that a judge of the Court of Appeal can sit as a judge of the High Court: see section 9(1) of the [Senior]Courts Act 1981 . Accordingly a Lord Justice – even one hearing the primary appeal – could, sitting as a judge of the High Court, refuse leave to apply and thus clear the decks for this court to grant leave and add the substantive application for judicial review to the primary appeal, if that was the sensible and most cost-effective way of dealing with the matter.”