That does not sound too good. I doubt that the weird laws allowed outright dangerous practice but you never know. I don't know your landlord (obvs!) but you a

That does not sound too good. I doubt that the weird laws allowed outright dangerous practice but you never know. I don't know your landlord (obvs!) but you are probably keener on your own well being than they are. Please get some advice: blow a few quid (bucks, whatever) on a sparky. If you have a friend who knows what they are on about then bribe them to come over and cast an eye over things. Just to re-iterate the point: it is not normal for your bathroom light to cause a USB (bus) to crash in another room.