“If, as here, the taxpayer has made an inaccurate self-assessment, but without any fraud or negligence on his part, it seems to me that it would frustrate the scheme's aims of simplicity and early finality of assessment to tax, to interpret s 29(5) so as to introduce an obligation on tax inspectors to conduct an intermediate and possibly time consuming scrutiny, whether or not in the form of an enquiry under s 9A, or self-assessment returns when they do not disclose insufficiency, but only circumstances further investigation of which might or might not show it. I should emphasise that I say that, not in reliance on Miss Simler's information to the Court that the Inland Revenue do not customarily make much of an initial check of self-assessment returns and accompanying documents. Such practice, if it is general, cannot affect the proper interpretation of the statutory provisions, though it would appear to me to be inconsistent with the aims of simplicity and speed of the new statutory scheme as I read it, namely that there is nothing in the Act that obliges an Inland Revenue officer to enquire into a return, for example in a case such as this, to obtain expert valuation evidence for the purpose of checking the accuracy of a valuation indicated in a return.”
“On this point I respectfully prefer the approach of Arden LJ, which seems to me to be more in accord with the wording of the subsection and the restrictive approach to its interpretation favoured by all three members of the Court of Appeal.”