Key legal question
Whether the Federal Court could hear a nullity appeal against an incidental decision refusing destruction of surveillance data.
Extracted holding
The appeal was inadmissible because the challenged interlocutory decision did not cause irreparable legal harm.
Extracted reasoning
The call list did not itself irreversibly affect the appellant's legal interests; the legality of the evidence could still be examined by the trial court, and mere procedural disadvantage is insufficient.