Thanks, I hadn't thought of doing that. Useful URL too!
Presumably this only works for those whose FTTC service is delivered via BT Wholesale, so it wouldn't work for Sky or TalkTalk customers (at least those at LLU exchanges)... unless I've misunderstood things.
Yes that's right - it must be BT based to work.
NB. I posted this while I have a line issue of my own
Last weekend I lost half my VDSL speed - restarted router etc. rechecked IP Profile and it was still half my normal one. Picked a phone up and found it was dead. Tested in TEST socket, still dead.
xDSL only needs one wire to limp along while voice needs two wires - so I guess I've a breakage along the way.
I've been in the hands of Zen (my line provider) and OpenReach ever since... #Painful.