Timbrook99 wrote:

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.

You do realise that *you* shouldn't be touching that don't you?

Perhaps if your modem/fax/phone started "having intermittent problems"
and BT had to send an engineer out, and you offered him/her nice tea &
biscuits the "fault" would require a new faceplate to be fitted ;-)