"This comes with a spacer which means the workings at the back does not need to go as far into the recess. However the screws are only 30 mm and will not reach. It is necessary to buy longer screws. With these everything becomes straightforward."
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Review 2 for MK Logic Plus 2-Gang 2-Way Dimmer Switch Mains/Low Voltage 300W White
"Very good dimmer, I like to use MK if I can but they are a bit expensive but you get what you pay for. Make sure you have a deep metal box in the wall as using the supplied pattress for a plaster depth one makes the switch bulky and even then the space in the box will be tight."