Power Distribution for Devialet

[Confused]

Having discovered the 'electric' screwdriver test trick, I have checked the phase on the various mains sockets in my room. Much to surprise, they all correctly show 'live' on the fuse size of the plug. If you are wondering why this is surprising, my house was built in the late 70's, and some of the things that happened in UK house building in the late 70's ('house bashing', as it was known) left a lot to be desired. My own brother was in a team of guys doing electrical installations on new builds in the early 80's, only one guy in the team was a qualified electrician, and I know that a lot of what was done was perhaps a little suspect. However, my own home is fully correctly phased and safe as it should be, oh the joy!