North-facing rooms receive a cooler, blue-toned daylight so choose a neutral colour ... If you live in a modern house, decorating walls in a single colour tends to make the room look boxy and ...

First on the electrical wire color code is black ... is not being used as a neutral but as a hot. Either way, these conductors carry current, so treat them as live at all times.

SORRY, E F Showell (Letters, Wednesday, January 11), if you are referring to the new harmonised domestic fixed wiring ... colours. I must inform him that they are brown for live, blue for neutral ...