BS 5446: fire detection & alarm devices for dwellings

BS 5446-2:2003 - Fire detection and fire alarm devices for dwellings - Specification for heat alarms

BS 5446-3:2015 - Detection and alarm devices for dwellings - Specification for fire alarm and carbon monoxide alarm systems for deaf and hard of hearing people 

BS 5446-4:2020 - Fire detection and fire alarm devices for dwellings - Specification for multi-sensor fire alarms using any combination of smoke, heat and carbon monoxide sensors