In reply to a post by MHC:

Demarcation point is the white master.

Why the master is so close to the junction is a little mystery - most BT Techs would have put the master where the junction box is. I would guess that at some time someone has moved the master to that point.

Just a thought. Might the 'white master' be an extension box, with the brown socket being the master? It doesn't look much like a master box (there was a link someone had with pictures of lots of old setups iirc).

That is an old style box - and they can be master. The brown certainly is not.

There are still masters available of that size - they start as secondaries and there is a small plug in master module. to convert them.

Very unlikely - but it would look nicer.

where the old phones used to be wired to, you are lucky you got Bt on yours, mine have GPO on and when I looked inside once I am amazied that my phone and broadband works.