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I think that the pipe which is a Y shape ie comes from boiler splits down to the UFH up to rads is heating flow (what boiler is it) a 2 port valve would need to be put in the leg that goes to rads (after split).Have you got a photo of UFH control unit.
It's a combi. The UFH is an Emmeti ewc-1... i've got this picture but access is cramped here.