Duncan Di Saudelli wrote:
The sort of numbers you are quoting suggests the voltage is simply induced
from the live running adjacent to the earth. I would probably

D'oh! Yes, an obvious contributor. Thanks - I shall pick up on your other
points (common reference via long lead etc.) and start afresh tomorrow. I
tyake your point regarding 1960s wiring and I shall look into the earthing
of the lighting rings.

thanks for the feedback. Time for some sleep!

Another thing to consider is the sensitivity of the volt meter, The more
ohms per volt, the more you are going to get confused.

Dave