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Hi, I'm Mike G and I'll be assisting you. You'll need to test the line and load of the switch with a 2 wire voltage tester or if you don't have a tester, remove the wires and touch them together to see if the light works. If it does replace the dimmer. If it doesn't we can continue troubleshooting.
I'm sorry but I didn't see the origin of the question. I'll need to opt out and let a UK Expert help you. Please stand by.