There are a number of options, but the first question is whether you have a neutral wire at the light switch. That will make a big difference in the available devices. But there are options even if you only have two wires.
There’s more information in the UK lighting FAQ:
There are many forum discussions of possible lighting control options for the UK. Before we get too theoretical, I just wanted to do a quick recap of the options that are available right now for those in the UK.
1) Choose one of the inside-the-wall micro relays from the official compatibility list and have it installed on the circuit where there is a third wire. Even if there isn’t a third wire in the switchbox itself, there’s still one on the circuit somewhere. It may be at the ceiling fitting, it may be somewhere else in the wall, but it is there.
https://www.smartthings.com/uk/compatible-products
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If you want to add a new faceplate to create a push button “momentary switch,” you can modify many switches to work with the in wall relay.
Plastic button front plates are quite…
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