Improvements in and relating to tamper evident seals

A tamper evident seal for a container having a screw thread and a closure means adapted for use with the container, the tamper evident seal comprising a normally circular ring which is frangibly linked to the closure means, the ring having one or more inwardly extending protrusions, and the container having one or more corresponding outwardly extending protrusions adjacent its screw thread, the or each protrusion on the ring having a leading face, and an opposing trailing face, and the or each protrusion on the container having a forward face and an opposing aft face, the faces being configured such that the leading face of the or each ring protrusion approaches the forward face of the or each container protrusion when the closure means is being fitted onto the container, and wherein any protrusions on the container or ring are situated or grouped in spaced apart locations about a perimeter of the container or ring and the normally circular ring is able to pass over the protrusion or protrusions on the container substantially without stretching and by deforming out of round.