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Cheers. The issue I have is that I don't want all alarms to be hard wired, the cost and disruption would be too much, but I believe that those that are on the landings have to be hard wired for the regs so I need the two to speak to each other.
aggi
Airhead
Generally when you hard wire them you use a multicore cable and also wire them together. In which case you can choose from the range of different smoke alarms depending on your budget. I normally budget around £30 per smoke alarm, being a requirement they tend to carry a bit of a premium price. Fitting can be expensive if you want concealed wiring depending on access to the ceiling void.