Did any breaker trip when you switched on? Any other lights now not working? Any chance you swapped what was the single black with one of the other blacks?
Yeah I turned back on and its tripped. No I tagged the live switch to make sure. Its come from the new lights wires you cannot tell what is the live and what's the neutral so I'm guessing I've wired them wrong.
This is the new light wiring. How do you tell? https://ibb.co/Lr1t1f1
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