On 18/03/18 21:24, alan_m wrote:
On 18/03/2018 21:12, ss wrote:


In addition, there will be a 10-year age limit for alarms and all
alarms will have to be ceiling-mounted, and should be
interlinked.".........

As they have to be interlinked do they also have to be mains powered?



No - you can get 10 year Li battery radio interlinked alarms. Bloody
expensive in comparison, but possibly cheaper than laying in new cabling
(depending on accessibility of the wiring route).

EI-Aico make them IIRC.