Smart Smoke Detector Setup and Recommendations

Hello everyone! I’m brand new to this community and to openHAB as well and I wanted to tell how impressed I was when I’ve discovered such a generous, helpful, and savvy community! I live in the UK and I need to buy a new heat/smoke detection system for my home. My electrician wanted to provide an old-fashioned and awful wired system with detectors and buzzers and a control panel on the wall, but I would like to have a smarter system I could check when away and with an app on a tablet/phone instead of an awful control panel on the wall… Something like this: [link] But I don’t want this!! British Standards says that my detectors (heat and smoke) need to be interlinked together and be connected to the main power. I was about to go straight to Nest Protect but what I read in this forum makes me think it might be a big mistake to go down that route… Would you have any recommendations on main-powered smart detectors which would work with OpenHAB? What sort of equipment/devices do I need to buy to make it work? I was planning to have OpenHAB on a tablet as a control panel instead of the awful panel shown on the link above… Many thanks in advance for your help! Chris