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Got it!Yes, as I said above a motorised valve is required on the flow pipe to the radiators which there appears to be already installed in the picture.
If I have understood the photo correctly the pipes with the blue and red lever valves will be the flow and return to the UFH and the, electrically unconnected, motorised valve above the red valve will be in the flow to the radiators.
Your explanations have really helped me understand it more, thankyou.