Eventually got my line sorted out - had extreme background noise but all good now. However my speed has dropped from 35mbs constant to around 15-16mbs. Here are the details:
Upstream line rate (kbit/s): 2000
Downstream line rate (kbit/s): 17999
Upstream noise safety coefficient (dB): 21.8
Downstream noise safety coefficient (dB): 18.3
Upstream interleave depth: 43
Downstream interleave depth: 2188
Line standard: VDSL2
Upstream line attenuation (dB): 3.7
Downstream line attenuation (dB): 11.3
Upstream output power (dBm): 7
Downstream output power (dBm): 10.6
Channel type: Interleaved
Can't live with that speed! What can be done?
George