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I've changed the pump mode / speed to CP1.Open the black arrowed valve 90 deg anti clockwise and increase whatever pressure its showing now by 0.3 bar but no more, reclose valve.
Flow pipe on boiler seems correct.
Will revert later re pump.
I just need to fully understand that valve does, and make sure that it isn't easily possible to go wrong in a way that matters in the long term. As usually, I don't do any of this stuff myself.