I am based in the UK. I was replacing a ceiling light when I noticed an issue.
When I used a voltage screwdriver the live wire in the ceiling pendant was showing a voltage present even when the wall switch is switched off (not expected)
When I switch the wall switch to "on" the tester glows stronger (which is what I expected)
The lamp in the ceiling pendant does go off when the switch isoff.
So I took the cover off the wall switch and tested the metal box base which appears to be earthed but still shows a voltage present too!
Should I be worried?