“30 Tax-free benefits (1) This section has effect as respects the disposal of an asset if a scheme has been effected or arrangements have been made (whether before or after the disposal) whereby— (a) the value of the asset or a relevant asset has been materially reduced, and (b) a tax-free benefit has been or will be conferred— Land Securities v HMRC (i) on the person making the disposal or a person with whom he is connected, or (ii) subject to subsection (4) below, on any other person. … (3) For the purposes of subsection (1)(b) above a benefit is conferred on a person if he becomes entitled to any money or money’s worth or the value of any asset in which he has an interest is increased or he is wholly or partly relieved from any liability to which he is subject; and a benefit is tax-free unless it is required, on the occasion on which it is conferred on the person in question, to be brought into account in computing his income, profits or gains for the purposes of income tax, capital gains tax or corporation tax. (4) This section shall not apply by virtue of subsection (1)(b)(ii) above if it is shown that avoidance of tax was not the main purpose or one of the main purposes of the scheme or arrangements in question. (5) Where this section has effect in relation to any disposal, any allowable loss or chargeable gain accruing on the disposal shall be calculated as if the consideration for the disposal were increased by such amount as is just and reasonable having regard to the scheme or arrangements and the tax-free benefit in question. (6) Where— (a) by virtue of subsection (5) above the consideration for the disposal of an asset has been treated as increased, and (b) the benefit taken into account under subsection (1)(b) above was an increase in the value of another asset, any allowable loss or chargeable gain accruing on the first disposal of the other asset after the increase in its value shall be calculated as if the consideration for that disposal were reduced by such amount as is just and reasonable having regard to the scheme or arrangements in question and the increase made in relation to the disposal mentioned in paragraph (a) above. … Land Securities v HMRC (9) In relation to a case in which the disposal of an asset precedes its acquisition the references in subsections (1)(a) and (2) above to a reduction shall be read as including a reference to an increase.”
“a specific and limited purpose, that of providing a set of rules, to be applied in computing a gain on a disposal of shares, directing how to ascertain the acquisition cost of the shares disposed of and the time at which those shares are treated as acquired …. If Parliament had wanted the rules to have wider effect - for example, as the Revenue contend, to treat the shares as retained for CGT purposes beyond the scope of the computational rules - it would have had to use clear and compelling words that it was introducing a deeming provision to be applied for such other CGT purposes.”
“We find that suggestion to be completely untenable, because if the whole loss was then conceded, [Land Securities] would plainly avoid the realisation of the gain indefinitely, even if it found it difficult to reverse the gain with tax-free dividends, and the result would in practice be precisely as if we had allowed, rather than dismissed, the Appeal.”