MarkR

We have mains operated interlinked (but not wireless) smoke detectors on the landing on 3 floors of a 3 storey house. We want to add mains operated smoke detectors in 3 bedrooms on the top 2 floors and a mains operated heat detector in the kitchen on the ground floor. We want to interconnect them to the existing system. Can we do it with wireless detectors? Or would we need to replace the existing detectors with wireless ones? And will we be able to link the mains power to the lighting circuits in the bedroom, so as to avoid having to cut entire new channels in all the ceilings? I don't know what brand the exising detectors are - they have a logo that looks like a diamond made out of a big triangle on one side and four small triangles on the other.