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I've linked it to my Phillips Hue lighting. It turns them on and off at random times when I'm out of the house.
You can get Nest on Amazon Warehouse for £105-130 now, mine was perfect apart from someone doodling in the installation manual. Only annoyance is that I can't wall mount it as the current house wiring doesn't allow it and Nest charges £30 for a plastic stand!
Next buy is a Samsung SmartThings starter kit.
Jell, nice bit of kit, I was playing with one in a plumbers merchant the other day.