HIYA, WHATS THE BEST METHOD OF ADDING TO A SET OF GARDEN LIGHTS SWITCHED FROM THE HOUSE, CURRENTLY TWO ON THE CIRCUIT RUN FROM A SINGLE SWITCH. I WANT TO ADD THREE MORE LIGHTS ALL TO OPERATE FROM THE SINGLE SWITCH. THANKS.
You should be ok to just carry on from the last light, to the next light and so on.
This would be no worse than what you already have.
If the twin and earth is buried in the earth, its not technically to regulations, as its not protected. Any vigourous digging would slice the cable and is not guarranteed to cut off the power as the cable has no earthed metallic outer sheath.
But if its just under the patio, at least its visible when you lift the slabs.
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