Whether you believe in ghosts or not, the concept of their existence has caused debate amongst conspiracy theorists for centuries. I can’t count the number of sleepovers I attended throughout my teens, during which somebody had the fabulous idea of telling a ghost story with only the eerie light of a torch for comfort. I might be ballsy now, but as a teenager I was so easily scared. And, whilst my pals turned in for the night and quickly fell asleep, I lay wide awake – not daring to close my eyes out of the genuine fear that a demon would be inches from my face when I opened them again –…