Had a call out last weekend - living room lights keep blowing MCB when turning on.
Turns up and I ask owner any changes any drilling and building work to house (his answer no).
Spent 30 mins checking reading and bits and bobs and I was exhausting my experience.
I thought 1 last thing to try so I pulled light off the ceiling to find it wired incorrectly customer said it had always worked (there is no way in hell it would ever work the way it it was wired)...
On the way out I wanted to spit out my gum so opened the house wheelie bin and there was a box inside for the light that I just wired correctly for him!!!!!!!!!!!!!!!!!!!!!!
PS I did take the fitting of first but it looked OK as I was only checking connections were made not thinking that some idiot had touched it especially after saying that no changes had taken place.