I need smart fans! Help (UK)

There are lots of choices. You can get a smart wall switch if the wiring for the fan supports that. Or you can get a smart fan with a remote and then use the bond controller or something similar to bring that into smartthings. But it all depends on the exact model numbers. What country are you in? The device selection does very.

So take a look at the fan FAQ. Although it mentions Alexa in the thread title, it applies whether you are using a voice assistant or not.

FAQ: 2020 Ceiling Fan and Dimmer light wall mount control compatible with SmartThings and Alexa?