All of the BT socket faceplates in my house have been replaced with very nice flat brushed stainless steel ones which look very nice. The trouble is it means I cannot identify which one is the master socket. Can anyone give me any pointers as to how I would recognise the master socket by removing these faceplates? I've looked everywhere for a white plastic "split face" box to no avail.
It could be there is no master depending on who fitted them. It may be that you have an external demarcation point so there is no need for an internal master socket but that's unlikley.
Anyway the difference is easy to spot if you take off each front plate as extensions have no additional components but a master has several the biggest and most obvious being a ring capacitor which will normally be a cylinder about the diameter of a pencil and maybe a couple of cm long. The standard place for a master socket is the first socket after the cable enters the premises.
Always worth looking at how the line is actually fed to your house, overhead, underground ? Then just follow the cable on from there. Sounds like you have had an attack of the decorators, so may well not be a recognisable NTE in the entire property.