(57) A closure for closing the mouth of a container having a screw neck finish, the closure comprising an inner part adapted to interengage with the screw neck of the container, an outer partto be applied overthe inner part when in position on a container and including a depending skirt connected to anchor means by tearable or frangible means, and drive means on the inner and outer parts of the closure which are interengageable with one another is use to allow the inner part to be unscrewed from a container only once the anchor means has been separated from the depending skirt and only be relative axial movement between the outer and inner parts during unscrewing whereby the closure closure is tamper-resistant until separation of the anchor means and child-resistant thereafter.