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Dear Blue Duck, I think you'll find a 'volt stick' is a dam good tool (you even suggested it?) as long as your know how it works and what it can do and what is has problems with.  As with any bit of kit, if you don't know how it works... don't use it! I'm more than wise to that, but thanks...

Use a non contact voltage indicator. (Not a 'recognised bit of kit I know but in this case the safer option rather than trying to use probes.)  Use barriers to make the area around the suspect cable safe.   Post warning signs to identify the problem.  Then go hunting. Never, ever,  'short...

Last time I looked it was the consumers responsibility regarding earthing.  If the earth lug has come off the lead supply cable the supplier has no need to do anything but say for us/you to make it a TT.  The system in question may have been installed like that (TT) for one reason or another. ...

I wonder if the OP is still alive?

Measure voltage between line and earth, then line and neutral.  What is result. If you have identified the line conductor and cannot get a Ze result then you have no viable earth path.  Some meters pre-test but this reads 'ok' at very high values' DO NOT DEPEND ON THIS as an indicator to a...

C2 no doubt about it.  A larger sample size is required rather than calling it a C3.  There is a difference in a sample size and 'further investigation required' as detailed in GN3.  The sampling procedure should be modified if there is reason to doubt the integrity of the installation and the...

Is that open enclosure the DNO's?  I Z If the fuses are sealed by the DNO then what has this to do with the test?  They should not be tampered with in the first instance.  But it is late, and I'm half asleep. Z

Just trying to find my way about.  Talk soon Zimmy