If the fence has caused a potential danger and the council won't do anything about it. If the fence is mutual in terms of the title deeds then it has been erected without your consent. In addition it is a common law nuisance as it is affecting the amenity, enjoyment and safety of your home. On both grounds you could take your neighbour to court for an order to have the fence removed. You will need to instruct a civil court lawyer on a private basis and seek the costs of the action from your neighbour in due course, assuming a successful outcome. I hope that helps. Please leave a positive rating so that I am credited for my time.