Duration of detention or guardianship
5The amendment by section 12 of this Act of section 43(1) of the principal Act has effect in relation to any application for admission for treatment and to any guardianship application made after the date on which section 12 comes into force and the amendment by that section of section 43(2) of the principal Act has effect in relation to any renewal of authority after that date ; and where an authority has been renewed on or before that date for a period of two years of which less than sixteen months has expired on that date that period shall expire at the end of eighteen months from the date on which it began.