Can I ask for advice, would it be ok to install underfloor heating as an additional zone on an existing s-plan circuit. The plan would be to have the thermostat for the room with the underfloor heating, operating the new zone valve, and at the same time switching the underfloor pump. Would it be acceptable for the room stat to be switching both the zone valve and pump to turn on and off simultaneously, without the need for an additional wiring centre? The new underfloor heating circuit would have its required manifold with blending valve but I’m wondering if my plan would work!? Many thanks in advance