Given the FTTP connection uses it's own "modem" (ONT) not the one built into the HH5, I guess there is still some uncertainty about whether VPN works, but I haven't had any problem with the HH5 and VPN on my FTTC connection.
There were some occasional rumblings of problems on the BT Community forums but these seem to have died off now, or just been overshadowed by the enormous cock-up BT introduced with their latest firmware updates to the HH5A.
Edited by deleted (Thu 26-Feb-15 17:49:21)