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Is that BG one wireless? If so, (based on experience with Tado and Hive), you'll need a smart thermostat and a new controller at the boiler. Tado will also want a little bridge/dongle plugged into your router, but they come as a kit.
It is DIY-able if you're confident (you'll need to turn the electric off and follow a step by step guide).
Bonus is you can then start fucking around with TRVs and get really anal about heating individual rooms.
I guess the follow up question is if I want a smart thermostat, do I just need a smart thermostat - which will include everything?
Or do I also need some extra gubbins to actually make it work?