CLOSURE

In various embodiments, a closure may include a base attachable to a container. The closure may further include an engagement insert receivable in the base. The engagement insert may include screw thread formations for engaging corresponding formations on a container neck. The base and insert may together form a co-operating uni-directional rotation arrangement which prevents rotation in a direction of screwing onto a container neck but allows relative rotation in a direction of unscrewing, whereby to prevent unscrewing of the closure. In various embodiments, a closure for a container may include a top deck, an outer skirt and an inner skirt. The inner skirt may be engagable with a container neck. The inner skirt and/or top deck may comprise one or more regions of weakness arranged to break and/or deform if an attempt is made to remove the closure from a neck following first application, whereby to prevent re-application.