Yes that's right, without the extension wire plugged in no sockets work. It's as if the signal has to go via the up stairs socket for anything to work. But upstairs is just an extension, I'm really confused. I'm at work now and don't have a landline phone but will see if I can get hold of one and check tonight. Thanks
Have you taken the cover off the bedroom extension to see if more than one wire runs into it? There could be one coming in from behind that wall as well as the one that you can see coming out of it.
It may be that that has been wired to be your "master" socket and all the other sockets run off that.
There is definitely only one wire going into the upstairs extension
I've got hold of a phone and I get no dial tone from any socket with or without the extension plugged in .
Where does the cable in the upstairs socket go to
@imjolly I believe that is the cable that is plugged into the left hand socket.
@Adey1982 I think you need to trace where the cable in the master socket goes to, it must go to a junction box somewhere to connect to the external cable. I think one wire has become disconnected somewhere which is why your phone doesn't work and broadband behaves oddly. If you can't see a junction box to investigate, report the fault as no dial tone at the master socket.
Wiring total mess and needs engineer visit to sort out
No it isn't, the wiring is perfectly good and and how it should be. Master socket on the right has incoming feed wired correctly to A&B, adjacent twin socket correctly wired from terminals 2&5 (with superfluous bell wire on terminal3) on the faceplate to 2&5 in both sockets of the twin and the extension lead correctly wired in the bedroom socket.
The problem is the incoming feed.
Thanks for your help guys. Yes that bedroom extension wire is connected to the left most socket in my first pic. The wire to the master socket goes straight through the window frame to connect to grey bt connection outside.
Line test produced an external fault on the line so engineer is being booked in .Still don't understand how the internet connection works with that extension cable connected only though, even through the test socket .He said it might be something to do with the extension pulling more signal through or something . We will see what the engineer finds. Thanks again for the help.
Broadband will sometimes work very slowly with one wire but telephony won't work at all. In an unbalanced condition like that anything might happen with extension wiring involved.
It might be worth having a look in the grey box to see if one of the wires has corroded through.
@licquorice was correct. Wires snapped off at connection on outside of house .very helpful Openreach guy replaced connection, drilled a new hole through wall and fitted a new filtered master socket and removed the superfluous box and extension. Now working fine. Still no idea why the upstairs connection made the broadband work but nevermind!
Thanks for your help.