Daniel John
Your 2 reds are your permanent live feeds, 1 black is your switch live coming from the switch so you need to put that in the live in the light and the other black in the neutral, block to 2 reds
Your 2 reds are your permanent live feeds, 1 black is your switch live coming from the switch so you need to put that in the live in the light and the other black in the neutral, block to 2 reds
Hire an electrician would be the best advice
One of the black wires should be in the live at the light. From what you have described I also think you may of put the lives in the live to the light not the loop live which is where I would expect them to be.
One of the black wires is a switch live and one is a neutral
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