On the installation day an engineer should install a modem, either a ECI or a HG612. Though he may not as you have a HH5 but I would request you use the supplied modem from Openreach(request the Engineer to install the modem he brought) and the HH5 to handle the PPPoE connection.
If you get a HG612 you can unlock it and use either bald_eagles
program or Roseway (DSLStats)
to monitor your connection.
You can find the Instructions to unlock the HG612 here
, it's on the right pane and there might be some more useful Information as well on there.
There is also a new up-to date firmware, which can be found here
I don't have much time at the minute but all the ones mentioned in the above topic should have a download link in this topic somewhere, here
. I don't have the time to go through and individual post them at the minute but I will add them If I remember later.
The newer firmware is a lot better than the previous firmware, at least for me and the majority of others I believe.