I see it has been six months or so since my last post,.. and I thought it appropriate to wind this thread up once and for all,.. as the last post still had no real answers.

Much to my frustration,.. I engaged with BT several more time since May '25,.. each time they visited the premises,.. went to the exchange and cabinate reseated wires etc etc.
But post each visit I was always left with a 'Your service is fine sir' I'm measuring FULL spec. bandwidth
However I was only getting 76/10,.. where download was sub 10MBps below par..
So disappointed as I was, I just rescinded myself that was it, I was never going to see 20MBps upload..
Now six months on I did an adhoc check,.. and knock me down with a feather,.. I am now achieving 80.1/19.2MBps.
I have changed nothing,.. I am actually at the same config as I started, albeit a newer BT modem,.. uptime is in the 36days+ and growing....
So beats me what has changed,... yes I know the BT side 'learns',.. but I assume it should still give better than 10MBps when speed checked...
and thats where I'm at ATM...
I thank folks who have given feedback,.. and suggestions, and given me insight into configs etc
KR