master socket does not work but all other sockets do
over the past week weeks had issue with slow adsl, move din 7 years agao no issues. Just found that plugging into the master sock and test socket gives no deal tone but every socket in the flat works fine. Now flat had a secirty alra, BT RED service which was removed when i moved in years agao. Attached pic can anyone tell whats going on. Front on the master plate has no wiring so assume thats why does not work.