In the Supreme Court, arguments were heard from the parties to the case.
Lord Toulson, with whom the other members agreed, said that the general power of a magistrate to issue a search warrant on ex parte application of a police officer, given reasonable belief that an indictable offence had taken place and that there was material likely to be of substantial value to the investigation on the premises, section 14 of the Police and Criminal Evidence Act 1984 mean that journalistic material was classed as "special procedural material" and did not fall under the general power. Application had been made under both the general and the "special material" sets of access conditions, and only the "special material" set was applicable.
Special material, fell under section 9 and Schedule 1, and the application consequently had to be made inter partes and to a circuit judge.
The issue was whether the court might have regard evidence given by the applicant but not disclosed to the respondent.
The principle in Al Rawi that, as a general rule, a respondent should have access to evidence on which the case was based applied to criminal and civil trials, did not extend to applications to obtain evidence from a third party whose substantive legal rights were not involved.
However, since the hearing was inter partes a discrete, substantive legal issue arose. Equal treatment meant that the crown court judge should not have taken into account the ex parte evidence.
Therefore the Divisional Court was correct to quash the order, and the appeal was dismissed.