I live in the solent area - Havant PO9 to be exact. I've had an email fron ntl saying that the expected release date for my postcode is the 23rd of January and that I should be able to prebook.
However when I rang sales the guy I spoke to said that he hadn't been trained on tvdrive yet and that he couldn't take a booking yet. So fingers crossed that is is the 23rd Jan.
I will be ringing them again at the end of the week to try again. If you manage to book anything please post and let me know