(1) In this section, 'relevant person' means a person that is required to deliver a statement to the Commissioners under a provision of this Part.
(2) Where, at any time, it appears to the Commissioners, that a relevant person -
(a) has failed to deliver a statement, or
(b) has not delivered a full and proper statement,
required to be delivered under a provision of this Part, the Commissioners may make an assessment on the relevant person of the amount which, to the best of their judgment, is the amount of stamp duty which would have been charged on the statement if it had been delivered and if it were full and proper.
(3) The Commissioners may serve notice in writing of the assessment of stamp duty on any relevant person.
(4) Subject to subsection (5), where an assessment is made on a relevant person under subsection (2), the relevant person shall be liable -
(a) where the relevant person has failed to deliver a statement, for the payment of the stamp duty assessed, and any interest a
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