146.—A court which has deferred the making of a children detention order in relation to a child pursuant to section 144—

(a) may make the order before the expiration of the period of deferment if during that period the child is found guilty of any offence, and

(b) where it proposes to make such an order, whether on the date originally specified by the court or by virtue of paragraph (a) before that date, may issue a summons requiring the child to appear before it and, if the child does not do so, may issue a warrant for his or her arrest.