Thanks.
I'm still astonished that the Initial build was such an electrical mess.
One electrician is back to.morrow ; it turns out there's another fault, this time in the downstairs rooms. Using the stair light is tripping the fuse box, and he thinks that someone has put a nail or something similar through a cable, which is making a crossconnection. Hopefully, day 3 will be the final day, cos Xiao-Xiao is getting fed up of hiding under my bed when it's too noisy.