Paul:

It's not unusual for people to just add a light circuit to any cables they can find either. I've seen mood lighting connected directly to a cooker circuit!!!! via a lightswitch, no RCD, no fused spur, nothing! Just a 45 amp MCB ..

DIY work is generally scary, particuarly when done by idiots! [Linked Image]

They should do basic electrical safety as part of school! E.g. what an RCD actually does and why we have fuses!