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Let's determine if your combi boiler supports OpenTherm first. If we opt for OpenTherm control then we would need to find a way to send Switched Live from the boiler's PCB back to the motorised valve (Brown). As soon as boiler starts it would energize the valve and open it. Easiest way would be...

That's clever way to do it;). By "I have to switch the underfloor on" do you mean the pump at the manifold or something else? It's definitely possible to connect the Hive by sending the Switch Live to any 240v device you need to turn on. Photos, video or drawings would help to plan it.

hi, did you manage to get this replaced? I curious to see whether it's the mixing valve that is stuck.

Did you manage to figure it out? If not please post some photos of the motorised valves. How are you currently turning the basement zone on. Is it with a thermostat?

If you don't mind both starting at the same time wire hive with opentherm as this will provide compensation and optimised start/stop. As you mentioned the motorised valve isn't wire so it's probably always open. Do you have mixing valve, actuators, wiring center on the underfloor? It would help...