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In article ,
(Timbrook99) writes:
I have an old GPO jack plug fitted onto a standard wall box. I want
to replace it with an up-to-date socket so that I can use it. I
haven't been able to find its details online so if anyone can help,
I'd be grateful.

You can't simply swap them. The jack plugs run the phone bells in
series, and you'll need to change the circuitry for parallel phone
operation, which will require rewiring the separate bell box you
should have too (or disconnecting it). Probably best to consider
it as starting fresh with a master socket where your two wires
enter the house, and then wiring extensions where you want them.
You could reuse the existing wire to avoid wrecking decorations.
It also requires re-jumpering the phones if you want to continue
using them. Obviously, you aren't really allowed to do this
yourself though.

This change will probably also affect your line rental. People
without modern phone sockets get a discount on the line rental
(but pay rental for the phones). The jack plug scheme you have
was also an extra rental charge option. It might be that your
line rentral will drop if you get BT to do this officially for
you. Don't know what they charge for doing it though.

--
Andrew Gabriel