Andy, have you tried contacting BT to report a fault?
It may be due to dry joint or something. They will carry out an automatic test and can often detect such problems.
I assume your telephone delivery is on overhead lines. Mine is and I get 8Mbit/s on the copper line and 37 - 42 Mbit/s on infinity 2. Our overhead line is about 300m from the cabinet.
Try BT first to see if they can identify a fault.
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