To reply to my own message (Sorry!!!)
Problem solved.
Once again followed the guide at
http://www.kitz.co.uk/routers/zyxel_VMG8324-B10A_vdsl_setup.htm , after reseting the Zyxel modem.
The menu options changed so something must have been screwed up.
Additionally, disabled PhyR Ds & PhyR Us & SRA (On by default) it is now working
I am getting 9 Mbps more 'Attainable Net Data Rate' than the Openreach HG612 Modem.
Very happy 'bunny'
..... I have escaped from SKY (long story) and have at last got a fast line (Compared to 3.5-4 Meg).
My Line Stats:============================================================================
VDSL Training Status: Showtime
Mode: VDSL2 Annex B
VDSL Profile: Profile 17a
Traffic Type: PTM Mode
Link Uptime: 0 day: 0 hour: 15 minutes
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 20.063 Mbps 80.103 Mbps
Actual Net Data Rate: 19.999 Mbps 79.987 Mbps
Trellis Coding: ON ON
SNR Margin: 15.0 dB 17.1 dB
Actual Delay: 0 ms 0 ms
Transmit Power: 6.9 dBm 13.9 dBm
Receive Power: -7.1 dBm -1.9 dBm
Actual INP: 0.0 symbols 0.0 symbols
Total Attenuation: 14.1 dB 15.8 dB
--------Zyxel------------
Attainable Net Data Rate: 34.515 Mbps 114.522 Mbps
--------HG612------------
Attainable Net Data Rate: 34.053 Mbps 105.620 Mbps============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 4.6 22.1 32.3 N/A 11.4 26.5 40.7
Signal Attenuation(dB): 4.6 21.1 31.2 N/A 13.4 26.2 40.6
SNR Margin(dB): 15.4 14.9 15.0 N/A 17.1 17.1 17.1
Transmit Power(dBm):- 2.6 -21.2 6.5 N/A 11.4 7.7 7.1
============================================================================
P.S. Thanks to dmcdonnell for the Zyxel VMG8324 ex Eircom F1000.