Dave
As my play pen is remote from the house there was a chance that the Earth at the end would float up in respect to the actual earth it's self so I bunged in a rod now I am confident that I have a true Earth in the play pen as well as the Earth rod fo the house.
Dave not done much house bashing I was more to heavy power and high voltage , as I was a SAP and did live line working and underground live jointing it's a different world , we were the supply authority for a village owned by the firm I served my time at I have seen most of the meter work but best not tell how here

Earth testing is a major field in its self not a simple matter well that's what my paper was about the other was lightning
I have polluted this thread to much so I will now go quiet
Stuart