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Wouldn’t you have to somehow retrieve the old live cabling if you did that? I don’t love the sound of just chopping it and whacking a load of tape around it.
NickCJ-
From the existing ones? They look like battery operated.
Even the alarm connected ones we had turned out to be battery operated. Not sure what the use case for power line operated smoke detectors are in a residential setting TBH; probably useful in an office where cabling them is super easy and you want them to talk to each other.
Howard
Get two battery ones - they are about £25.
For minimum disruption Re-use the same spots in the ceiling as the old ones, assuming their positioning wasn’t silly.
Mains powered seems a bit ott and would mean messing up decoration somewhere and then it will end up in the easiest position to cable rather than the best position for catching potential fires.