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Apologies, all. It seems that (what I thought) was a TRV on the UFH manifold is, in fact, a "TMV" (Thermostatic Mixing Valve). as oppose to a Thermostatic Radiator Valve (I got a clue when I Googled TRV and saw that the "R" stands for Radiator )
@ShaunCorbs yes, there's a TRV on the radiator that has the grey pipe going to it and I can remove and test anything you would like? Just let me know what you'd like me to do and I'll try it. Thanks
Remove the trv the rad will act like a bypass and the 125 shouldn’t appear