SRM - i have many SS devices running on FTTC (not BT infinity, but the same technology) and they are fine.
Nothing at all to do with PPPoA/PPPoE or MTU size (which is the main factor) as the 1500 used by PPPoA is reduced to 1492 by PPPoE as an extra byte of data is needed in the header, making it 1500 anyway.
I'm not sure why VF offer that as their final clause, as an internet connection is an internet connection... governed by the modem and router making the call.
It's all down to the router manufacturer, along with the ISP, to not mess around too much with standard settings, locking away options that should be available to allow 'not too common' traffic to traverse it.
Becuase the SS needs to make a bi-directional secure vpn link back to the vodafone network to carry the voice traffic (you would probably be pretty annoyed if someone could snoop on your calls though your router) and BT have not accounted for this, that is why it does not work.
The later hubs have a "port clamping" mode, that does not play silly games with vpn links, and is generally a good fix to things not connecting.
Ditch the HH, and replace with something a bit more open, and not geared to the masses who just want to watch cat videos on facebook, and you will find it works fine. (the latest netgear home offerings are almost just as bad, so avoid)
Anyways - glad things are now better on EE, and hope you find someone who wants a nearly new SS... although be aware, if it does not connect for over 3 months, you may be selling a brick anyway
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