BS OHSAS 18001 has been withdrawn and replaced by ISO 45001
BS OHSAS 18001 has been replaced by ISO 45001 the new international standard for occupational health and safety management.
Much of the DNA from BS OHSAS 18001 can be found in ISO 45001, so you'll recognize the principles but many enhancements are delivered in ISO 45001 including stronger leadership, better worker involvement and a focus on health, particularly mental health.