Thanks, I will look into the Evo home as Honeywell is a known brand.
I'm happy to have the radiators controlled via manifold with actuators or actuators on the radiators, i just want it to work with the downstairs UFH controls, I don't know if everything has to be the same brand to be compatible. If it does, a poor brand might go bust in a few years and if an actuator fails, you end up having to replace everything.
Heatmiser seem to have a good range & reviews, Salus has poor reviews.
Hive and Nest all seem to be highly priced wireless aimed at retrofit or people who prefer no hard wiring.