(1)This section applies if—
(a)an amount has been deferred under section 135, and
(b)circumstances arise that require the shipowner to be treated as if he was not entitled to defer all or part of the amount.
(2)The shipowner must give notice of the fact to the Inland Revenue, specifying the circumstances.
(3)The notice must be given no later than 3 months after the end of the chargeable period in which the circumstances first arise.
(4)An assessment to tax chargeable as a result of the circumstances may be made at any time in the period which—
(a)begins when those circumstances arise, and
(b)ends 12 months after the shipowner gives notice of them to the Inland Revenue.
(5)Subsection (4) applies in spite of any limitation on the time for making assessments.