20(1)Subject to sub-paragraph (2), where, otherwise than on the application of the offender, a court proposes to exercise its powers under Part 3, 4 or 5 of this Schedule, the court—
(a)must summon the offender to appear before the court, and
(b)if the offender does not appear in answer to the summons, may issue a warrant for the offender’s arrest.
(2)Sub-paragraph (1) does not apply where a court proposes to make an order—
(a)revoking a youth rehabilitation order,
(b)cancelling, or reducing the duration of, a requirement of a youth rehabilitation order, or
(c)substituting a new local justice area or place for one specified in a youth rehabilitation order.