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I dont have a pic and I am not there to take one, but it doesnt look perticularly old if that helps :? Am I right in thinking some testers have a no-trip setting using three test leads, so you include the incoming neutral?

I am assuming pretty much the same, test between main earth and incoming line at RCD and thanks for speedy reply :)

Electricity company's RCD? and yes TT

If there is an RCD on the DNO isolator how would you go about testing ZE?