Thanks for the advice - current test is
However I don't know how to display the ThinkBroadband history graph that I have from early this year to current date which clearly shows the drop.
I also have BTW speedtest results which I don't know is helpful towards an interpretation.- these currently show speed 1.93Mbps, DSL connection rate 6.3Mbps (Down), 0.45Mbps (up), IP Profile 2Mbps
I may have problems with PO support who completely blanked me yesterday afternoon and said I wasn't going to get anything better! I think my only route is now to write to their complaints office and see if someone will look into this further. Newnet did have problems with early May where they asked me to turn off my router when not using the computer - which I'm informed was resolved by them and concerned only certain makes of router - it was not the line that was a problem.
Hopefully someone can make some sense of this for me so I can make the case.
Thanks again for the help