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luckily all light switches have a light indicator show the current status.

Except when the bulb has gone. Which is the one time you really want to be sure the power is off.

In that case removing the broken bulb and sticking your fingers on the metal bits also works.

Both switches should be turned 90 degrees and move horizontally.

Hahaha yes!

Yup I've got some like these in the house here.