Good evening everyone, I've just got hold of a drain map for the land I am considering purchasing.  It shows there's a pipe running almost straight through the middle of the would be building.  It's an end-of-terrace plot of land where the owners of the existing house is splitting the title and selling it after having obtained planning permission.  We plan to explore the option of modifying the permission and including a basement and perhaps taking the ground floor out as clo