"If you have an ADSL service with each phone connected to a micro-filter then the bell-wire is completely redundant since a bell signal is generated in each micro-filter for the few
which still need it. Now, unfortunately, this bell-wire tends to cause some degradation to the ADSL signal as it travels about your house. The Solwise solution to this problem would be to detach the front section of your master socket and disconnect the bell-wire(s) (from pin 3) and re-fit the faceplate. The BT solution is called the iPlate! This device
places a filter on the bell-wire (which remember is not required!)."
50p or 10/- ?