Update. Just received a visit from an angry mother and her apologetic 12/13 year old son! He noticed the hose when he was walking up the lane to walk the dog and thought it would be funny to switch it on - he didn't realise it would be on all night! He also turned on the tap the other times, as a joke! Anyway when his parents were discussing my email on the village system he owned up to it. He has apparently received a lecture from his father regarding the waste of water and how elderly (!) people living alone could be intimidated by this kind of behaviour. He apologised to me and has had his games console and phone taken away and been grounded for a week, he is only allowed supervised computer access to do his homework. I think his apology was genuine and the punishment from his parents is enough, however, they have asked me to think of something he can do for me to make amends. I don't really want to punish him further but at the same time I don't want to undermine his parents ideas of discipline.