Home security

[Blue62]

Getting to the stage where I am having to start to think about securing my new build and wondered if anyone can give me the benefit of their experience. I don't want wireless and would like the sensors to be as unobtrusive as possible, be good to have sensors outside the house (front and back) and maybe some CCTV, though I'm not convinced of the benefits. Budget up to £2.5k but I'd like to get away for less.