No. You need the bridge.
So I currently have Hive which I am happy with, however I have one room which always get notoriously hotter than others in the house, I have no desire to control this one room remotely, can I just get a single tado smart TRV without the bridge or thermostat etc and just stick it on the Radiator? set the desired temp on the TRV and just forget about it?
Or just get a TRV and use it as a temperature monitor in addition to the TRV on the radiator. Not the cleanest method but cheaper.