The UK Noise at Work regulations 1989 requires a noise assessment to be made by a competent person to identify exposed persons and any requirements for hearing protection if any person is likely to be exposed above the first action level (an Lep,d of 85dB(A); a rough guide to this level is if two people have to shout to be understood when 2m apart).
Canford offers several ways to meet this requirement when using headphones or headsets, as either pre-fitted level limited headphones and headsets, or the ability to add limiters to your existing headphones and headsets after assessments.
See Hearing protection and noise control for available product details or for further information, please see the linked resources.