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The total amount of chargeable gains that are treated as accruing to any person under subsection (3) of section 284A in respect of any such benefit as is referred to in that subsection shall not exceed the amount of that benefit.
Where, after any assessment to tax has been made on the basis that any chargeable gain is treated as having accrued to any person under section 284A(3)—
all such adjustments shall be made (whether by way of assessment, amendment of an assessment, repayment of tax or otherwise) as are necessary to secure that no person is subjected to any greater liability by virtue of section 284A(3) than he would have been had the indication been given, or the final determination made, before the making of the assessment.
The periods allowed by this subsection are—
Subsection (3) above has effect notwithstanding any time limits relating to the making or amendment of an assessment for any chargeable period.