Next I tested my lighting circuits which don't have any earth wires connected. I am replacing some existing lighting circuit wiring as I have the ceiling pulled down during renovations. I have linked the lighting earth to one of the existing socket earths. I found that connecting the bulb from live to earth did not cause a trip. I also tried with a 60w and 100w bulb. Just to ensure earth continuity I connected the lamp from live on a socket junction to earth on the lighting junction, this did not trip. Is there some wiring that may need to be changed at the consumer panel to get this to work? I wouldn't touch the consumer panel myself but I'd appreciate any advice so I can get someone in if required.
Note that I ensured nobody else in the house would touch any metal objects that might be earth bonded.