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Yes, probably should have made that clearer. Switch all the lighting circuits off at the consumer unit.
That way you won't have a live wiring loop to deal with if you happen to be dealing with a switch line setup.
Just switching off at the light switch will not stop a lighting loop from having power.
Airhead
This is the stevo_com approved method of safety and testing. Best one is when the light and circuit stays on, with the wall switch off. Fun times.