Thanks for your reply. It'll be a professional install for a domestic system, although it is a fairly big house with a large square footage. Would like to have an app to monitor/set etc, but don't need to have monitoring. Prefer to stick to wired as house undergoing renovations and have easy access to run wires, but ability to expand later if necessary would be good. Also wondering about including smoke alarms into the system... is this sensible?
Also, had different opinions on best way to cover house - couple of companies suggesting usual PIRs/contacts etc, one steering away from this and more towards perimeter shock sensors on windows instead. Does anyone have any thoughts about this? I'm not unduly concerned about intruder access while occupied which is the main advantage of the shock sensor route I guess, but the house is rural and so main issue is protection while empty. I also have CCTV covering the house...