18Duty of persons with parental responsibilities to notify change of address to local authority looking after child
(1)Where a child is being looked after by a local authority, each natural person who has parental responsibilities in relation to the child shall, without unreasonable delay, inform that authority whenever the person changes his address.
(2)A person who knowingly fails to comply with the requirement imposed by subsection (1) above shall be liable on summary conviction to a fine of level 1 on the standard scale; but in any proceedings under this section it shall be a defence that—
(a)the change was to the same address as that to which another person who at that time had parental responsibilities in relation to the child was changing; and
(b)the accused had reasonable cause to believe that the other person had informed the authority of the change of address of them both.