master telephone sockets

First of I know one should not move the master telephone socket and it is the property of BT Openreach, none the less my grandparents live in the Kent country side and have done for the last few years. Where they are living now, they have never had very good broadband speed. Typically getting...

My property has 2 master sockets connected to the incoming phone line; the original one with all 4 extensions throughout the house which is installed at the front entrance, in the hallway. A new separate one, just inside the living room from the hallway master socket, was installed by BT for...