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Thanks Joe. Can I just remove the front panel to change the battery or is there any alarm sysytem installed that will set it off? I assume I switch the breaker in the consumer unit first?

Hi. Just joined. My first request for help is this. I want to replace my dining room ceiling light with another. When I turn off the switch in the consumer unit before starting work the alarm goes off outside. This is because the guy who installed it 13 years ago took the supply to the alarm...