Good luck,maybe cancel the test (cooling off period) and monitor consumption over 6 months,if you can turn the gas off at the meter control valve when not needed(main cock) even better.
I too, doubt that it will come back inaccurate given my research into the subject... just limited for what else could be the cause.
I live in a mid terrace; if it was theft, how the heck do I go about sourcing the problem?! I'd happily press charges if it ever came to that, but without digging up all my pipes I wouldn't know where to start .. :/
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