When he uses the BT Performance Test, ask him to continue to the Further Diagnostics button at the bottom of the page.
It will ask for the phone number then give some graphics he can ignore unless the downstream is red, and in the text box it will give his IP Profile. That number might help us.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync 57584/13846kbps @ 600m. - BQM