Unfortunately, this sight is all too common to pest controllers: these cables have been chewed on by squirrels. Not only is this a huge fire risk, anyone entering this loft space and inadvertently touching the exposed cores could suffer electric shock. In a confined space and probably on their own, an individual in this situation could face a very uncertain future.
We located and sealed off the entrance hole, removed any remaining squirrels and made the folk aware of the issue. In addition, we know a fantastic electrician who is familiar with rodent damage and working in the conditions they create. He will replace the damaged cables as soon as possible and restore the circuits to a safe state.