you doing a wanky "grand design" project ?
I'd assume you need either need mains powered interlink smoke detectors or bs 5839 pt1 fire alarm
normally somebody with an understanding of construction & buildings regulations like a competent architect would have advised or taken advice on whats required ?
err..have'nt interlinked mains powered smoke alarm been a requirement for new builds for the last 25yrs or so ?
Looking at there site its does'nt appear to confirm to any std ?
Is the property wired & plastered yet ?
apart from the last month or so when its not been working..
yes, rather than having alarms with Police URN's & Dualcoms, Bet Fred use https://www.alarm-monitoring.co.uk
you pay your money & take your choice...