Worcester B 35CDI

My Worcester Bosch CDI 35 has a wired thermostat on the wall which has 2 wires from the boiler and 240v power supply (owl intuition c thermostat) 4 in total

I can tell which the 240 wires are, but The wireless thermostat needs 2 wires by the looks of it, but how do I know which of the two wires going to the boiler go where In the thermostat

Or do I need the wired smart controller

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