Today I needed to remove a 50 year old storage radiator from a flat my son has just bought and is doing up. I isolated the spur at the consumer unit
I then randomly grabbed the nearest screwdriver, which thankfully was a mains tester type (with a neon light in the handle to test for live electrics) to remove a switch cover to investigate how it was wired. As I touched the screw, the bulb illuminated - something I hadn't seen before.
After checking with a second mains tester (as I couldn't believe my eyes), I switched off the power to the entire flat at the consumer unit and will leave it for the proper sparky to sort out as I have no idea why the circuit breaker didnt go

I wouldn't normally use a mains tester screwdriver to remove a switch cover, but I am pleased I did
