Are there any ceiling down lights that can work with the sensors and gateway to come on/off automatically?
It's a two vertical flat pin plug. I use a travel adapter. It's fairly low profile
Does this come with a UK socket adapter or do you have to buy one separately?
If you're adding Zwave devices to Smartthings, usually pair without problem, and it's local processing. If you're adding Zigbee devices, you might need a custom device handler, the community provides, this page lists the Xiaomi devices https://github.com/bspranger/Xiaomi/tree/master/devicetypes/bspranger You add custom devices through this page using the login details setup for your ST (UK and euro zone) https://graph-eu01-euwest1.api.smartthings.com/. Xiamoi devices are cloud based processing. ST community pages are there to help.
Thanks for the info, do the Xiaomi sensors and samsung smartthings hub work together?