Solved. Thanks to all.
For the curious. I had problems during week, and had engineer out this morning. part of my issue seemed to be the original install (analogue connection left at box?).
But afterwards, only connected to modem, i got full upload, but connected to router, less than half.
I just reset router to default and reinstalled. Working for now.
Oh, testing upload using speedtest.net (london) and My broadband speed site
The opinions I express are not my own, I stole them, blame the other guy
and as mentioned in a comment
Not helpful.Far better not to post if you cannot push matter forwards.