The nest thermostat works with ST. Takes a little bit of set up (NEST) and you need to keep polling it with pollster (https://community.smartthings.https://community.smartthings.com/t/nest/817/9/t/pollster-a-smartthings-polling-daemon/3447). But mine is up and running.
I also changed the code a bit to make the interface on the smartthings app a bit more user friendly for the uk version ( I.e. No cooling, etc.). But I am happy to share if you go down this route.