Thank you all very much for your help.
Spark123/SparkySpike, there is a second fuse box next the the main box that doesn't do anything when the switch is turned off. I have unscrewed the panel and there are 2 live fuses, one marked PEAK and the other OFF.
I presume that this means the...
I recently move into a new house and in each bedroom there is a switch (at the usual socket height just above the skirting) which doesn't appear to do anything. They are not next to any other sockets and are located where I would expect to find a single socket in each room.
I unscrewed the...