I would imagine he's referring to the dynamic pressure when water is flowing rather than a standing pressure.
Reasonable but even on the last repair a mere trickle would ignite the boiler wheareas now we're back to full flow & not a peep from it.
I'm getting a little fed up with it now, maybe it's reached the age where it just cannot be repaired effectively & I should get a new boiler. But not from BG...
