'[33] More particularly, it is plain from the wording of the statutory test in s 29(5) that it is concerned, not with what an Inspector could reasonably have been expected to do, but with what he could have been reasonably expected to be aware of. It speaks of an Inspector's objective awareness, from the information made available to him by the taxpayer, of “the situation” mentioned in s 29(1), namely an actual insufficiency in the assessment, not an objective awareness that he should do something to check whether there is such an insufficiency, as suggested by Park J. If he is uneasy about the sufficiency of the assessment, he can exercise his power of enquiry under s 9A and is given plenty of time in which to complete it before the discovery provisions of s 29 take effect. [34] In my view, that plain construction of the provision is not overcome by Mr Sherry's argument that it is implicit in the words in s 29(5) “on the basis of the information made available to him” (my emphasis) and also in the provision in s 29(6)(d) for information, the existence and relevance of which could reasonably be inferred from information falling within s 29(6)(a) to (c), that the information itself may fall short of information as to actual insufficiency. Such provision for awareness of insufficiency “on the basis” of the specified information or from information that could reasonably be expected to be inferred therefrom does not, in my view, denote an objective awareness of something less than insufficiency. It is a mark of the way in which the subsection provides an objective test of awareness of insufficiency, expressed as a negative condition in the form that an officer “could not have been reasonably expected … to be aware of the” insufficiency. It also allows, as s 29(6) expressly does, for constructive awareness of insufficiency, that is, for something less than an awareness of an insufficiency, in the form of an inference of insufficiency.' (5) that the assessment of whether the officer could reasonably have been expected to be aware of the insufficiency falls to be determined on the basis of the types of available information specified in s 29(6). These are the only sources of information to be taken into account for that purpose: see Langham v Veltema at [36]: '
'[Counsel for HMRC] said that this was the wrong test. HMRC had to know with reasonable certainty of the insufficiency in question otherwise the office could not have been “aware” of it. There is, no doubt, an epistemological debate to be had about whether you can discover or be aware of something that does not in fact exist. In the present case, for example, the commissioners decided that there was no insufficiency. Had HMRC discovered or been aware of an insufficiency before their decision that there was in fact no insufficiency? Or had they been aware of it, but then ceased to be aware of it? And now that I have disagreed with the commissioners on one of the points, are HMRC aware of it again? Or have they been aware of it throughout? But I do not consider that I need to enter into this debate. In the present case the commissioners asked whether HMRC had sufficient information to make a decision whether to raise an additional assessment. That seems to me to be the right test.' [20] A not dissimilar test was applied in the Court of Appeal. Sir Andrew Morritt C said (at [56]): '… I do not suggest that the hypothetical inspector is required to resolve points of law. Nor need he forecast and discount what the response of the taxpayer may be. It is enough that the information made available to him justifies the amendment to the tax return he then seeks to make. Any disputes of fact or law can then be resolved by the usual processes. For these reasons I would dismiss the appeal of HMRC.' [21] To the same effect, Moses LJ said (at [69] - [70]): '[69] … As the Chancellor points out (at [56]), awareness of an insufficiency does not require resolution of any potential dispute. After all, once an amendment is made, it may turn out after complex debate in a succession of appeals as to the facts or law, that the profits stated were not insufficient. I have dwelt on this point because I wish to leave open the possibility that, even where the taxpayer has disclosed enough factual information, there may be circumstances in which an officer could not reasonably be expected to be aware of an insufficiency by reason of the complexity of the relevant law. [70] I also wish to express polite disapproval of any judicial paraphrase of the wording of the condition at s 30B(6) or s 29(5). I think there is a danger in substituting wording appropriate to standards of proof for the statutory condition. The statutory condition turns on the situation of which the officer could reasonably have been expected to be aware. Awareness is a matter of perception and of understanding, not of conclusion. I wish, therefore, to express doubt as to the approach of the Special Commissioner in Corbally-Stourton v Revenue and Customs Comrs [2008] STC (SCD) 907 and of the Outer House in R (on the application of Pattullo) v Revenue and Customs Comrs[2009] CSOH 137 ,[2010] STC 107 , namely that to be aware of a situation is the same as concluding that it is more probable than not. The statutory context of the condition is the grant of a power to raise an assessment. In that context, the question is whether the taxpayer has provided sufficient information to an officer, with such understanding as he might reasonably be expected to have, to justify the exercise of the power to raise the assessment to make good the insufficiency.' [22] It is important to emphasise that the decision in Lansdowne did not involve any qualification of what Auld LJ in Langham v Veltema identified as the question posed by the second s 29(5) condition. The hypothetical officer must, on an objective analysis, be made aware of an actual insufficiency in the assessment by the matters disclosed in the s 29(6) information. This is made clear by Sir Andrew Morritt C at [55] of his judgment in Lansdowne . The sole dispute in that case was whether the disclosures made by the taxpayer's accountants were sufficient to cause the hypothetical officer to conclude that there was an insufficiency. [23] The passages in the judgments of Sir Andrew Morritt C and Moses LJ as to the level of the officer's awareness were directed to the Revenue's argument that the disclosures made required inferences to be drawn about the accuracy of the self-assessment based on certain legal assumptions and that the officer could not be expected to resolve issues of law in determining the impact of the information supplied. In the face of such uncertainties, the officer could not be taken to be 'aware' of an insufficiency. The decision in Lansdowne confirmed that the officer was not required to resolve (or even be able to assess) every question of law (particularly in complex cases) but that where, as Moses LJ expressed it, the points were not complex or difficult he was required to apply his knowledge of the law to the facts disclosed and to form a view as to whether an insufficiency existed. That is a matter of judgment rather than the application of any particular standard of proof. And the reference to the officer needing to reach a conclusion which justified the making of a discovery assessment has to be read in that context. [24] Mr Sanderson's case is that the Upper Tribunal overstated the level of knowledge which needs to be imputed to the officer under s 29(5) in order to justify the making of a discovery assessment. The threshold is said to be a relatively low one and merely requires the officer to be able to justify his belief that further tax is due. Part of Mr Gordon's argument rests on eliding the requirement in s 29(1) for an officer to 'discover' that there is an insufficiency in the return with the condition in s 29(5) that the notional officer could not have been reasonably expected, on the information available, to be 'aware' of that insufficiency. Unless, it is said, the threshold of knowledge is set relatively low it would be difficult, if not impossible, in most cases for the Revenue to be able to raise an assessment under s 29(1). [25] I do not accept that sub-ss 29(1) and (5) import the same test and that the Revenue's power to raise an assessment is therefore directly dependent on the level of awareness which the notional officer would have based on the s 29(6) information. The exercise of the s 29(1) power is made by a real officer who is required to come to a conclusion about a possible insufficiency based on all the available information at the time when the discovery assessment is made. Section 29(5) operates to place a restriction on the exercise of that power by reference to a hypothetical officer who is required to carry out an evaluation of the adequacy of the return at a fixed and different point in time on the basis of a fixed and limited class of information. The purpose of the condition is to test the adequacy of the taxpayer's disclosure, not to prescribe the circumstances which would justify the real officer in exercising the s 29(1) power. Although there will inevitably be points of contact between the real and the hypothetical exercises which sub-ss 29(1) and (5) involve, the tests are not the same. […] [41] I would endorse what the Upper Tribunal said in [78] - [79] of its decision in Charlton : '[78] The correct construction of s 29(6)(d)(i) is that it is not necessary that the hypothetical officer should be able to infer the information; an inference of the existence and relevance of the information is all that is necessary. However, the apparent breadth of the provision is cut down by the need, firstly, for any inference to be reasonably drawn; secondly that the inference of relevance has to be related to the insufficiency of tax, and cannot be a general inference of something that might, or might not, shed light upon the taxpayer's affairs; and thirdly, the inference can be drawn only from the return etc provided by the taxpayer. [79] As we have described, the balance provided by s 29 depends on protection being provided only to those taxpayers who make honest, complete and timely disclosure. That balance would be upset by construing s 29(6)(d)(i) too widely. Inference is not a substitute for disclosure, and courts and tribunals will have regard to that fundamental purpose of s 29 when applying the test of reasonableness.'