Before I left UK I fitted the old fella's house with WEMO wifi light bulbs and a couple of cameras. He had recently departed from this world and I had been left with the responsibility of looking after the place until we sold it. The reason for the WEMO stuff was that I was at work from early morning to late evening most days (and then in t'pub) and I wanted some sort of security for the place. The 'random' lights switching on and off was a good feature, a bedroom light would come on, then the landing light and next the bog. It did look like there was someone in the place. I had one camera pointing at the front door and the other at the kitchen window, they would send me emails if any movement was detected. I remember one time my sister popped in to look for something and when she left I called her from work and told her she'd left something in the kitchen. She said "how did you know that? It's my tea!"
If I had been staying there any longer, my next step would have been to add a 3G backup connection to t'internet, after all, all it takes is to cut one pair of wires (or a fibre) and the whole lot goes off line.