(1) The Principal Act is amended -
(a) in section 18, by deleting subsection (5),
(b) in section 46, by inserting the following after subsection (7):
"(7A) The making of enquiries by the Commissioners for the purposes of subsection (7) (a) or the authorising of inspections by the Commissioners under subsection (7) (b) in connection with or in relation to a relevant return (within the meaning given in section 49(6A) (b)) may not be initiated after the expiry of 4 years commencing on the date that the relevant return is received by the Commissioners.
(a) The time limit referred to in subsection (7A) shall not apply where the Commissioners have reasonable grounds for believing that any form of fraud or neglect has been committed by or on behalf of any accountable person in connection with or in relation to any relevant return which is the subject of any enquiries or inspections.
(b) In this subsection 'neglect' means negligence or a failure to deliver a correct relevant return (withi
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