What is the difference between BS and BS EN standards?

Could you elaborate on the key distinctions between the BS and BS EN standards in the context of industry regulations and compliance? I'm particularly interested in understanding how these standards differ in terms of their scope, applicability, and the level of rigor they impose on products and processes. Are there any specific industries or sectors where one standard is preferred over the other? Additionally, what are the potential implications for businesses operating in multiple jurisdictions if they adhere to different standards?