Wait.
One of the most powerful things about Smartthings is its ability to integrate with third-party systems using a protocol called OAuth. Everything from IFT TT to harmony universal remote to visual dashboards like smarttiles to rules engines like smart rules, etc.
This currently works only for US accounts. It’s supposed to work for UK accounts, but it turned out multi region authorisation fails because the third parties are being directed to the US servers and they can’t find the UK account there. Smartthings without this integration just isn’t the same system. Support is very aware of the issue, it is being worked on, but I wouldn’t even start evaluating the system until this problem is fixed.
Much discussion in the following topic (this is a clickable link):