(1) An exemption
certificate ceases to have effect at the end of 2 years after it is signed
unless —
(a) it
is withdrawn by the Premier; or
(b) it
ceases to have effect under section 77; or
(c) it
ceases to apply by reason of an order under section 87(2),
before the end of that
period.
(2) Subsection (1),
other than paragraph (c), does not prevent the Premier from signing a further
exemption certificate in respect of the same document.