“1. The Commissioners’ opinion referred to in section 73(6)(b) is an opinion as to whether they have evidence of facts sufficient to justify making the assessment. Evidence is the means by which the facts are proved. 2. The evidence in question must be sufficient to justify the making of the assessment in question: C & E Commissioners v Post Office[1995] STC 749 , 754G. (Emphasis added) 3. The knowledge referred to in section 73(6)(b) is actual, and not constructive knowledge: C & E Commissioners v Post Office at p755D. In this context, I understand constructive knowledge to mean knowledge of evidence which the Commissioners do not in fact have, but which they could and would have if they had taken the necessary steps to acquire it. 4. The correct approach for a Tribunal to adopt is (i) to decide what were the facts which, in the opinion of the officer making the assessment on behalf of the Commissioners, justified the making of the assessment, and (ii) to determine when the last piece of evidence of these facts of sufficient weight to justify making the assessment was communicated to the Commissioners. The period of one year runs from the date in (ii): Heyfordian Travel Ltd v C & E Commissioners [1979] VATTR 139, 151; and Classicmoor Ltd v C & E Commissioners [1995] V & DR 1, 10.1.27. (Emphasis added) 5. An officer’s decision that the evidence of which he has knowledge is insufficient to justify making an assessment, and accordingly, his failure to make an earlier assessment, can only be challenged on Wednesbury principles, or principles analogous to Wednesbury … (see Classicmoor … at 10-11,and more generally John Dee Ltd v C & E Commissioners[1995] STC 941 , 952 per Neill LJ).” 19. Similarly, it was common ground that section 73(6)(b) should be construed in accordance with the observations of Aldous LJ in the Court of Appeal in Pegasus Birds Ltd v C & E Commissioners[2000] STC 91 , who upheld Dyson J’s approach stating (para 11): “The relevant evidence of facts is that which was considered, in the opinion of the Commissioners, to justify the making of the assessment. The one-year time limit runs from the date when the facts constituting the evidence came to the knowledge of the Commissioners.” (Emphasis added)
“An opinion as to what evidence justifies an assessment requires judgment and in that sense is subjective; but the existence of the opinion is a fact. From that it is possible to ascertain what was the evidence of facts which was thought to justify the making of the assessment. Once that evidence has been ascertained, then the date when the last piece of the puzzle fell into place can be ascertained.” 20. It is clear from these dicta, which in my view are a correct statement of the law, that section 73(6)(b) addresses the assessment which HMRC has in fact made and not a hypothetical assessment which they might have made but did not. The words of the subsection are clear: “facts, sufficient in the opinion of the Commissioners to justify the making of the assessment.” (Emphasis added).
“was the finding one which the tribunal was entitled to make?”