This section applies while—
a child is placed for adoption under section 19 or an adoption agency is authorised to place a child for adoption under that section, or
a placement order is in force in respect of a child.
Parental responsibility for the child is given to the agency concerned.
While the child is placed with prospective adopters, parental responsibility is given to them.
The agency may determine that the parental responsibility of any parent or guardian, or of prospective adopters, is to be restricted to the extent specified in the determination.