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.
this post was submitted on 05 Jan 2025
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You could have a look at a shelly 1L that might do it, put the shelly in the light fitting and wire the switches in to it
Is this the one you are talking about? Looks like it will do the job?
Yes, that's the badger. They have a vast amount of built-in functions, also can be all local. I was using mqtt to access mine, but have switched to the home assistant integration
+1 for shelly, a few options that could work.
I'm in the UK and grabbed a bunch of generic switches of AliExpress and they all work perfectly.
Buying electrical stuff from AliExpress scares the shit out of me.
Not just 240v, but in-wall 240v!
Not even a chance to smell the magic smoke.