You can force the ADSL mode if you login to the router via telnet and issue a few commands.

Carry out this procedure at your own risk.

Click here

PeteB

In reply to a post by MrSaffron:

Not now, but when daylight I would be giving that router a reboot just to see if things improve

ADSL modems only every drop the connection to connect at slower speeds, i.e. if the line gets even fractionally better it does not renegotiate the speed automatically. It waits for us humans to decide when we don't mind the connection dropping.

I turned the router off and on again shortly after 8.00 this morning. The bandwidth shown on the router increased by all of 48 Kbps (!) but there was no change whatsoever shown on the TBB speed test.

Seems to fit in very well with your comment.