Therma 3 way system

Hi all, we have a system identical to what is described here: https://community.tado.com/en-gb/discussion/5198/am-i-missing-something-with-trv-setup?

I can't see any replies other than what Nick has said, so I'm wondering what extra I might need to buy to make it work with that setup? Will Tado work easily? I can't find the boiler install instructions as I haven't purchased Tado yet, so I can't even see if the installation is straight forward.