Update ancient wiring?

[#1]

The BT internal wiring in our house is archaic.  There's no 'master' socket where one can isolate all extensions in order to test the exchange line connection.
Can I get BT to modernise the internal wiring?

[#2]

Unfortunately not.
What we can do, is process you an "internal shift", which is basically a master socket move. Unfortunately, it's not very cheap and I'm not sure if it'd be rational in your circumstance.
Matty

[#3]

Hi oldcelt, what you need is an external fault (ie not due to any fault/damage internally that might have been caused by the inhabitants), then when an engineer visits, that socket problem should then be rectified by them fitting a new Master socket (for which there would then be no charge).