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Two way mains connected light switch (UK market)
(lemmy.world)
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There are plenty of zigbee options available on Amazon UK (and I would expect some wifi too, but I have already a zigbee network so I prefer it when possible). Do a quick search there, most of them have the wiring diagram in the photos. Some of them can be installed in the box, so you don't have to replace the switches (which may be ugly compared of the others you have). Also note that if both the switches you want to replace control the same light you just need to replace one of them.