LLU to BTW migration

I'm thinking of moving away from Talktalk to a BTW provider (IDnet). My line is fully unbundled, and I'd want IDnet to take on both phone and broadband.
The last time I looked into the costs and process, no one had a stright answer. Some providers looked at it as a new line, others as a migration, and BT as a return to doner.
Does anyone know if this has changed, and is there a reasonable process (and cost) for migrating away from an LLU provider?
I've spoken to IDnet who inform me that there is no charge to move the phone line to them, and the broadband migration would be free 'with a migration code'....

As it is full LLU you do not get a migration code, suggesting IDNet does not understand the situation fully

Nothing has changed really with regards to moving back from a full LLU service.

Thank you - thats what I thought (and feared) might have happened...

They've just got back to me with a corrected price.
£38.35 for the phone line reconnect and then £48 for a new ADSL provision.

In reply to a post by gromit69:

They've just got back to me with a corrected price.
£38.35 for the phone line reconnect and then £48 for a new ADSL provision.

BTretail voice will take back the phone for free if you sign a 12 month contract - using the "return to donor" process.

Then you can choose any ISP that can operate on a BT phone line, including O2/BE, or any "half LLU" services.

Yeah, that did cross my mind. Though I have a feeling I'd end up paying the £38 back through BT through their more expensive packages

On a slightly related note, does anyone other than Be/O2, AAISP and PlusNet provide Annex M?

Talk Talk Business offer it on their kit, (both ex-CPW and ex-Tiscali exchanges).

Matt