I think I know the answer to this but hey ho , If you have a leak on your water main between the stoptap in the road and the one inside your hous e whose responsibility is it. It may be a shared main as well. Also If I had to put in a new main to bypass the problem as the previous owners built an extension over where the main runs who is reponsible for reconnecting next doors main if it turns out we do share the same main?????