A little help needed

[#1]

I have an old bt master socket, 4 wires, orange, white, green and black. Am i right in thinking it would be good to have this replaced, socket and wiring. The socket is about 12 inches inside my house, wire goes straight up to the roof. Is this mine to pay for?  Is bt responsible as its so old?
Thanks for any help

[#2]

It is a old GPO socket, it is now the property of the British Telecom (BT), you will need BT to replace it with a NTE5 master socket.
The demarcation point between BT & subscribers is after the master socket - i.e. BT supply that socket and subscribers can install their own wiring after that. So step 1 will be to get BT to install that master socket.  Its location should be inside your home and the wiring up to your home is British Telecom's responsibility.  (Though not necessarily at their expense)
[Edit]
Deleted bad info.
[Edit]
You can ring British Telecom on 150 or 0800 800 150 and place the order for the socket to be converted from hardwired to plug and socket.
Hope This Helps

[#3]

Thanks midnight, i will call them in a mo  
Edit.
"sorry, that is not a BT number, please call your service provider"
hmmmm

[#4]

Rather than calling BT you should ring your phone service provider. If you pay line rental to Plusnet then ring them. I would imagine updating the master socket counts as Sales.

[#5]

plusnet just told me to look through yellow pages for an electrician (pref, ex bt). Oh well, stays the way it is for now.

[#6]

Bad advice. Electricians can only install extensions sockets and wire these into the removable part of the master socket. They can't modify any wiring coming into the house before the master socket.