If—
(a) a person is on trial for an offence against this Act; and
(b) under this Act, the jury may find the accused not guilty of the offence charged but guilty of another offence against this Act; and
(c) there is more than 1 other offence of which the accused may be found guilty;
then, notwithstanding any other provision of
this Act, the accused is not liable to be convicted of more than 1 such other
offence.