Supplementary to Audible Alarms: VADs are significantly productive in higher-sounds places or where Listening to protection is worn, supplementing regular audible alarms. As a way to stay clear of discrimination, BS EN 54-23 compliant VADs might be set up in all sanitary accommodation (not simply WCs) and all lodge bedrooms, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/