haha!! Are you saying that it's common for householders to have every lamp switched on a circuit, including exterior lighting?? I don't know what world your living in but it's not mine. Diversity ''always'' needs to be applied, especially in domestic installations, or you'll be asking the DNO for a cut out fuse of around 160+A.
not in my house, kids leave bathroom lights on , bedroom lights on, living room lights on.
my kids don't do diversity...........:coolgleamA: