18 In concluding its analysis of s 424, the High Court said at [48]:
Given all the considerations described above, the phrase "[w]ithout limiting subsection (1)", as it occurs in s 424(2), means that the procedural restrictions on the specific power to issue an invitation to give additional information do not qualify the RRT's general power in s424(1) to "get any information that it considers relevant".
19 Accordingly the High Court held that the Tribunal's oral request for information made in its telephone call to Mr Cheah did not involve a breach of either of ss 424(3) or 424B.
20 Counsel for the respondents attempted to confine the reasoning in SZKTI in various ways. Hence, it was submitted for the respondents that the Tribunal's power to seek information still had to be found in s 424 and that this Court still had to ask itself whether the acknowledgment letter involved the Tribunal in getting information it considered relevant in accordance with s 424(1) or inviting a person to give additional information in accordance with s 424(2) (and, in this regard, we note that subsequent amendments to s 424 are immaterial to the resolution of this appeal). Valiant though this attempt was, it cannot succeed in the face of the reasoning in SZKTI.
21 In short, we accept the submissions of the Minister's counsel. Following the decision in SZKTI, it cannot be said that s 424 is the only source of the Tribunal's power to obtain information. It has that power by dint of s 415(1) and the powers of the primary decision-maker in s 56 which the Tribunal thereby attracts. Further, the difference between ss 424(1) and 424(2) is to be found in the consequences of non-compliance, and not the making of fine distinctions between the Tribunal getting relevant information and inviting a person to give additional information. Section 424(1) is facultative. Failure to comply with such a request has no consequence adverse to the applicant for review. Section 424(2) is a formal request. It must be given in a particular manner (s 424(3)) and satisfy certain requirements (s 424B). Failure to comply with such a formal invitation has adverse consequences. The Tribunal may make a decision on the review without inviting the applicant for review to appear at a hearing (ss 424C(1) and 425(2)(c)).
22 In the present case, no adverse consequences flowed to the respondents. They were not deprived of a hearing. Hence, and as the Minister's counsel submitted, the only possible questions that arise in a context where jurisdictional error is required in order to vitiate the Tribunal's decision are whether the Tribunal had power to say what it did in the acknowledgment letter (which it did, ss 415(1) and 424(1)) and whether the exercise of that power contravened any provision of the Act (which it did not, as there was no question of the Tribunal proceeding to make a decision on the respondents' application if they did not provide any "documents, information or other evidence" in response to that letter). Accordingly, the appeal must be allowed.
23 The respondents' counsel made further submissions which, given our conclusions above, it is not necessary to consider. We do so nevertheless, albeit briefly. We do not accept that the acknowledgment letter, in the words of s 424(2) at the relevant time, was an invitation to a person to give additional information. According to this submission the acknowledgment letter is in the "optative mood" and thus expresses a wish or a request. We prefer a different interpretation of the language used. The relevant part of the acknowledgment letter, construed in context, is nothing more than advice to the respondents about how to ensure that their application is complete. This does not involve any permission to the Tribunal to avoid its obligations under ss 424(3) and 424B. Given the reasoning in SZKTI, the language of avoidance is inapt.
24 Decisions such as MZXRE v Minister for Immigration and Citizenship [2009] FCAFC 82 and SZLPO v Minister for Immigration and Citizenship (2009) 255 ALR 407; [2009] FCAFC 51 do not assist the respondents. They were decided before SZKTI. SZKTI, as the Minister submitted, determines the outcome of this appeal.
25 We would also be disposed to find that the appeal should be allowed on the ground that the acknowledgment letter did not fall within s 424(1) because it was not the Tribunal (as constituted under s 421 by the Principal Member to review the respondents' application) "getting" information in the conduct of the review. Rather it was an administrative exercise preliminary to the review. Its purpose was to provide the respondents with information about the review process and advise them of their rights. In our view it was analogous to a Court registry writing to a party to a proceeding prior to a hearing. Such a letter would, of course, come from the Court but would not involve an exercise of judicial power or be part of the conduct of proceedings before the Court. This approach is consistent with the reasoning in SZKTI. In that context, the exercise of power involved in sending the acknowledgment letter was purely administrative, engaging the powers attracted to the Tribunal by s 415(1). The provisions of the Act with respect to the constitution of the Tribunal (Div 9 of Pt 7) and of the Regulations about the powers of officers of the Tribunal (reg 4.36) do not support a contrary view. As discussed, the power in s 424(1) is expressed to be one "in conducting the review". This is different from the exercise of administrative power in connection with the review as referred to in reg 4.36.
26 For these reasons the appeal must be allowed with costs.
I certify that the preceding twenty-six (26) numbered paragraphs are a true copy of the Reasons for Judgment herein of the Honourable Justices Stone, Jacobson and Jagot.