Lockable closure fastening and tamper evident closure

A lockable closure for a container having a neck portion formed with a plurality of radially outwardly projecting arcuate thread portions, comprising a rotary cap provided with internal threads configurated to mesh with said arcuate thread portions;

• a tamper indicative locking element engageable with said rotary cap for relative axial movement with said rotary cap and including first means for preventing relative rotation between said rotary cap and said locking element when axially engaged, said locking element further including at least one thread runner arranged to engage an arcuate thread portion, said closure cap and locking element each being threadedly engageable with the thread portions of the container, said at least one thread runner being resilient so that once said at least one thread runner has traversed an associated thread portion it is movable out of alignment with the associated thread portion to obstruct unthreading of said closure cap from the container, said thread runner being constrained by said cap and locking element, to thereby also prevent removal of said rotary cap once said internal thread thereof and said at least one thread runner have fully engaged the arcuate thread portions, said locking element further including breaking means for permanently breaking said locking element when locked to the container thereby releasing said at least one thread runner from locking engagement with the arcuate thread portion thereby permitting rotation and removal of said rotary cap from the container and providing a positive indication of tampering with the closure.