“(1) If an officer of the Board or the Board discover, as regards any person (the taxpayer) and a year of assessment (a) that any income which ought to have been assessed to income tax, or chargeable gains which ought to have been assessed to capital gains tax, have not been assessed, or (b) that an assessment to tax is or has become insufficient, or (c) that any relief which has been given is or has become excessive, the officer or, as the case may be, the Board may, subject to subsections (2) and (3) below, make an assessment in the amount, or the further amount, which ought in his or their opinion to be charged in order to make good to the Crown the loss of tax.”
“that the [insufficiency in the assessment] was brought about carelessly or deliberately by the taxpayer or a person acting on his behalf.”
“Deliberate is an adjective which attaches a requirement of intentionality to the whole of that which it describes, namely “inaccuracy”
“for there to be a deliberate inaccuracy in a document within the meaning of section 118(7) there will have to be demonstrated an intention to mislead the Revenue on the part of the taxpayer as to the truth of the relevant statement or, perhaps, (although it need not be decided on this appeal) recklessness as to whether it would do so.”