Never ever use Talk Talk Broadband!
I supplied the TT with numerous MAC Codes into a deafening void of silence and when you do spend ages on the phone they tell you it's your fault for not supplying a MAC code at all (nonsense) or the one you supplied was wrong (in my case from BT)
Meanwhile you pay for their premium phone service with no broadband. Customer service is terrible and you'll grow old on the phone to them!
Paul