This page explains the BS5979, BS8591 and EN 50518 situations
The new European standard EN 50518 is the first of a new series of standards for alarm monitoring which are anticipated to form the benchmark for European ARC’s moving forward – particularly in terms of how the Police respond to relevant alarms.
The first EN50518 applies only to ARCs monitoring intruder and hold-up alarms. However, an EU standard takes precedence over UK standards and therefore UK ARCs have to adhere to it rather than BS5979.
As a result BS5979 has been withdrawn and superseded. It has been replaced by an interim UK standard called BS 8591 which covers the various alarms not covered by EN50518, 1.e. fire, social, CCTV, lone worker devices and vehicle tracking.
Although BS5979 has been withdrawn and superseded by BS8591 it still remains in force for existing ARCs. Any future ARCs will have to meet BS8591.
Which all shows how exciting is the world of standards!