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28.—(1) A certificate may be reviewed by the Department—
(a)either within the prescribed period or in prescribed cases or circumstances; and
(b)either on an application made for the purpose or on its own initiative.
(2) On a review under this section, the Department may—
(a)confirm the certificate;
(b)issue a fresh certificate containing such variations as it considers appropriate; or
(c)revoke the certificate.