My new neighbour last night told me he has had plans drawn up regarding exstention to his house.Part of this will be one on my side of his house .It will consist of a ground floor room with a 13 foot high pitched roof, it will extend out 5foot past the building line at the rear.The massive brick construction will be 8 foot closer to my house than it is now.I am at present in the process of selling my house which he knows about and I am petrified I am going to lose my purchaser, when he finds out and I will lose the house I am buying.We should be exchanging contracts within the month.Please please help what can I do