Quote:
Originally Posted by Virgin Salesman
They are aware (I have PM proof) that is enough! 
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A pm may not necessarily be proof.
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Quote:
Originally Posted by rogermevans
i can just about see why a British gas engineer may need one as they can demand access to property to make safe an installation even if no adult was home though that must be a rare ocurance
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The utilities (all of them) may require them as their engineers may need to enter a property whether an adult is present or not, to make the installer safe.