I was recently called to help an elderly friend whose interweb wasn't working. (It turned out to be a switch off router, pause, and now switch on router problem.) But while rumaging 'round the back of her telly I was really alarmed. She had 8 items running from an extension cord - phone, router, CD player, telly, DVD player, sat box, lamp and electric fire. This had all been done for her by a friend from church. All the excess length of cables were tidied up into coils with elastic bands.
I have looked at the RoSPA website and it doesn't really deal with the modern realities of out digital media world. It just says don't overload sockets.
Am I being v overcautious? I def remember in O grade physics being told never to run electricity thru a coiled cable.