I saw some of the discussions around the Shelly modules. I wasn't looking at them as didn't want a wifi solution (additional traffic/bandwidth/inability to use when wifi goes down). Having said that if I went with the Fibaro Single Switch option above (not the ZWave Dimmer2) then I'd be in the same boat.
I do appreciate I'm limited myself with HomeKit (didn't even use it for ages), but have become quite accustomed to switching things off from my watch, if someone didn't hit the switch, rather than voice command or an app on my phone.
Will give it some thought.