 has the meaning given in section 22C(6)(47); “relevant child” has the meaning given in section 23A(2) and regulation 3; and “responsible authority” means the local authority that last looked after the child(48). (2) In these Regulations, save as otherwise appears, any reference to a numbered section is a reference to that section in the 1989 Act. Relevant children 3. — For the purposes of section 23A(3), children falling within paragraph (2) are an additional category of relevant children. (1) Subject to paragraph (3), a child falls within this paragraph if— (a) the child is aged 16 or 17, (b) the child is not subject to a care order, and (c) on attaining the age of 16 the child was detained, or in hospital, and immediately before being detained or admitted to hospital had been looked after by a local authority for a period or periods amounting in total to at least 13 weeks, which began after the child attained the age of 14(49). (2) In calculating the period of 13 weeks referred to in paragraph (2)(b), no account is to be taken of any period in which the child was looked after by a local authority in the course of a pre-planned series of shortterm placements, none of which individually exceeded four weeks, where at the end of each such placement the child returned to the care of their parent, or a person who is not a parent but who has parental responsibility for them. (3) For the purposes of this regulation— (a) “detained” means detained in a remand centre, a young offender institution or a secure training centre(50), or any other institution pursuant to an order of a court, and (b) “hospital” has the meaning given in section 275(1) of the National Health Service Act 2006(51). (46) Section 23CA was inserted by section 22(2) of the 2008 Act. “Former relevant child” ha