Just found this thread after googling "talk talk moving home".

We're not exactly in the same situation as most of the above, but maybe some of you can offer advice.
We're moving home at the end of July. We have already bought the new place but are remaining in rented property for the time being for work reasons. Our current phone is with Talk Talk, but our broadband is Orange. (Don't ask, I know I'm wasting money...)

The phone in the new place has a dialling tone at present (the old owners moved out less than a week ago). I don't know if this means it's "active". We haven't tried using it - but (just tested) we get a ringing tone when we call it. Their supplier was also Talk Talk.

We're not bothered about keeping our old number, and would probably like to switch broadband provider anyhow, and rationalise the phone/ISP package. Thinking about BT for the lot, if that makes it simpler.
We don't use the landline much, and the internet connection is more important for our work.

What problems do you anticipate, and how can we avert them? Is there a recommended course of action here?
I imagine we should get the new line working as soon as possible (to avoid paying a reconnection fee?), although it means we will be paying for two services for a couple of months. We won't need internet at the new place until we actually move, but would like to be able to use it there as soon possible after that.

TIA