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Gray0689
Well, maybe that's where we disagree, looks like 35mm and 28mm UFH circuits with 22mm towel rail circuit to me. Can't be sure but the hw circuit looks like it could be 28mm as well.
To me when the underfloor and hot water on together
The flow that all them manifolds need and don't forget 6 pumps going and a shunt pump there starving the hot water coil the wY it's plumbed
As has been said a few times if you was to shut down manifolds one at a time eventually you will get the heating and hot water going
But needs re plumbed