Smart Light bulb suggestions for UK?

You can get it to work directly w/ the SmartThings Hub, but the process is a bit hacky.

Should you decide to return the bulb and try something different this is the list of officially supported lighting for the uk. Select a bulb you like and it will let you know the requirements. I’m personally a big fan of Lifx bulbs and they will do what you want, they are definitely an option to consider.
https://www.smartthings.com/gb/products/-/filter/categories/lighting-and-switches