I'm changing my door to open the opposite way and want to change my light switch to suit. Is it ok to put a junction box where the old switch is and run a new flex to the new location? The current flex isn't long enough to reach the new location. I know I should probably replace the exsisting flex with a new/longer flex to the new location, however this isnt ideal because the flex goes up into the ceiling, which I'm not too fond of the idea of tearing up the ceiling and having it replastered again. I also can't access it from above as there's another flat and it would require their laminate floors being removed and then the floor boards under that. By moving the switch to the other side via a junction, do I need to have an electrical certificate or is it notifiable to my local building reg? From what I understand according to Part P of the Building Regs, I don't need to notify building regs, but I'm not sure if I need to have an electric cert? I seem to recall reading something previously as of Jan 2005 most electrical work needs to have a certificate?