As far as I can tell there are 2 x 3 core and earth (1mm) running from the wiring centre in the loft to the wiring centre by the ufh heating manifold. I assumed (incorrectly?) that this was to be used for control rather than control and power to the manifold/pump downstairs?Totally incorrect...all the heating controls should be fed from the load side of one switched fused spur. What you have is completely wrong and probably a major ball ache to put right.
The one saving grace is that if it is wrong it's still possible to get a cable from the loft to the utility room if required.