That’s it, I basically looked at the old filling loop including arrow and simply switched over apart from the smaller valve.
I’m going to turn off the mains tomorrow and take it apart again replacing the smaller valve and see what happens. Otherwise I am stuck.
Confirmed connected to the cold, what I will do is remove tomorrow and replace the NRV which I didn’t change noting the arrow direction on the current NRV as it’s tucked out of sight. Then remove and ensure the arrow on the longer valve is facing away from the pipe and in the same direction as...
About 1 hour ago when I disconnected from the hot water feed and put the hose into a bucket to test this pressure/ valve. At the same time I turned the NRV into a large jug to test this pressure. Now leaving for a minute to see what happens…