Lid and container having tamperproof means

A lid having an inverted U-section rim in which nests an inverted U-section lip of a container, the lid rim having at least one opening in the outer limb, characterised in that the outer limb of the container lip and lid rim are continuous around the lid, the outer limb of the container lip has an outwardly projecting portion which is received by the lid opening to prevent removal of the lid after application to the container and includes means to rupture the connection between the part of the lid outer limb in the path of which, in the direction of lid removal, lies the outwardly projecting portion of the container rim to thereby permit removal of the lid from the container.