this will cause some people to say this is why BT shouldnt spend cash on replacing copper as in your case it could be considered a complete waste.
Wasn't it the case that BT opted to replace part of the run? Perhaps they picked the wrong box A instead of B. Sorry I'm getting confused with I'm a celebrity BT would of course have a far more accurate way of determining where faults lay.
this will cause some people to say this is why BT shouldnt spend cash on replacing copper as in your case it could be considered a complete waste.
No, I don't think it was a complete waste. My line is capable of almost twice the speed that it was before. It's just that the actual fault is still eluding them.
My approach to the problem would have been this...... Connect a router to the various access points along the route between here and the exchange, and log the attenuation and noise. Then plot that against the wire length. Then investigate all deviations from the expected measurements.
I'd say no. I have seen BT do that with simple sync issues in the past. If they have no done that already, would raise questions, as it is a very simple thing to do.
Not as if they don't have a weather proof laptop now, is it?