"This dimmer works however, I would never fit these again. The back plate of the dimmer has a square shape that is meant to fit perfectly within a backing box so that the fittings is level. This creates two major problems - firstly it does not allow for any correction in alignment of the fitting. Secondly and this is the far bigger problem, this "frame" is as wide as a standard backing box preventling the dimmer module for being inserted. I have had to cut sections off the plastic dimmer fitting to get in in place. As a professional electrician it took me 35 minutes to install one of these. DO NOT BUY. Also the rest of the range is slighyly oversized. So if you buy a dual accessory backing box, you will find the fittings overlap. I repeat - DO NOT BUY."
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Review 4 for LAP 1-Gang 2-Way Dimmer Switch Mains/Low Voltage 400W
"Sadly with these products you really get what you pay for. The concept requires that the plastic plate that you screw into your box to be completely flat, so that the metal fascia can clip on. Sadly, if you don't live in a new-build with perfectly flat walls, this is a real problem!! The plastic plate is cheap quality and bends, so the slightest bend in the plate will mean the metal fascia does not clip on properly...."