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I have stripped wallpaper from an internal concrete wall (see picture). There are some chipped off and flaky patches. Is this just primer that has chipped off? Can I patch up the primer and paint the wall? If so what type of primer and paint should I use?

Hi I am installing some new lights in my flat and and am unsure which mains wire is live and which is neutral. The colours are black, yellow and green and the flat was built in the 70s. I am happy that green is earth but am unsure about live and neutral. I can't just follow the wiring for...