Subject to sub-paragraph (2) and section 91, a supervision order shall cease to have effect at the end of the period of one year beginning with the date on which it was made.

A supervision order shall also cease to have effect if an event mentioned in section 25(1)(a) or (b) of the [1985 c. 60.] Child Abduction and Custody Act 1985 (termination of existing orders) occurs with respect to the child.

Where the supervisor applies to the court to extend, or further extend, a supervision order the court may extend the order for such period as it may specify.

A supervision order may not be extended so as to run beyond the end of the period of three years beginning with the date on which it was made.