flynkiwi: Thanks Michael, will have to have a dig in the garden under the power box. The chorus tech seemed to think that ETP enclosures were only really installed from the late 80's and our house is early 80's.
In older houses it just arrives from either under the house or into the ceiling space and makes it straight to the "master" jack, I would first rip the top off all the jacks points and see if you can see the one with the black Polyethelyne sheathed drop cable. Sometimes it transitions from the drop cable to indoor cable either in the ceiling or under the floor (depending on overhead or underground drop) so you also may need to get in the roof or under floor and see what you can find.
Cyril