>> My question re the PAP2 was whether there might be an issue with my internet telephony and ADSL2.
Just to add to Eric's reply - Eric is spot on about your ATA device. If you think of the PAP2 adapter as simply a tiny PC that requires an Internet connection, then that should hopefully make it a bit clearer. The PAP2 adapter does not know, nor care, what type of DSL connection you have - as long as it's fast enough and good enough quality and stability for it to work effectively (this would only affect the quality of the calls anyway).
So rest assured that, as far as I'm concerned, your PAP2 ATA will continue to function exactly as it always has done.
As for moving DSLAM/MSANs... then I think it is likely that you will move onto one of the new 21CN MSANs, as these will have the ADSL2+ compatible line cards in, and be configured for <24Mb access. There is no way of knowing if the card you're currently on is compatible with ADSL2+, depends how BT managed the exchange upgrade, whether they installed new MSANs or just new line cards in the existing ones.
I guess it will also depend when your exchange was originally enabled for ADSL, and what DSLAMs have been installed in the meantime. Some of these are compatible with ADSL2+, some of the older ones aren't.
In short, there's no direct information available about this, so unfortunately it isn't really possible to answer your question with any degree of certainty at all!