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So if in that situation, you had a 3mbar drop on a g4 metre, your conscience gets the better of you and you decide to investigate. You isolate the appliances and prove the pipework is sound. You then test each appliance individually and find the gas valve on the fire is passing. What then? Do you leave it or have to condem it?
Once you have gone down that route thats it. I had a gas sqfe routine inspection not long ago and I had a 0.5 drop on the job he came out to. The gas safe guy confirmed no smell of gas on existing install its a pass. If I had decided to isolate appliances I would be obliged to find it.
 

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