Finance Act 1974

17 Where under subsection (1)(b) or (2)(b) of section 33 of the Finance Act 1965 or paragraph 18(4) of this Schedule the person making a disposal of an interest in land to which the principal section applies would, apart from this paragraph, be treated for the purposes of Part III of that Act as if the amount or value of the consideration for the acquisition of that interest were reduced or further reduced by some amount, the development gain, if any, accruing in respect of the disposal shall be computed as if the said subsection (1)(b) or (2)(b) or the said paragraph 18(4), as the case may be, did not apply to that consideration.