Supplementary to Audible Alarms: VADs are especially powerful in significant-sounds locations or in which Listening to defense is worn, supplementing common audible alarms. To be able to keep away from discrimination, BS EN 54-23 compliant VADs could be installed in all sanitary accommodation (not just WCs) and all lodge bedrooms, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/