An excellent, simple, product. The majority, if not all, of your light fittings and bulbs will be compatible, you just replace the light switch, plug socket etc and connect the new socket to the Link+ box via the LightwaveRF app (you do need to buy the Link+ box in addition to the sockets, but only one Link+ for the whole house). You can control the sockets through the LightwaveRF app, which is actually quite nice, or you can link the system to Google Home (which is what I've done) and control the system with voice commands, you can also link it to Alexa.
You can set routines and timers, control brightness, all without the need for expensive SMART bulbs. It's just what I was looking for, nearly all of my light sockets are now LightwaveRF (its nice to be able to turn the outdoor light on as I arrive home) and all of my important plug sockets (things with floor lamps etc plugged in).
I highly recommend this system.