The Piazza has moved to a temporary URL:

http://www.thepiazza.org.uk/thepiazza/bb/index.php

There are some unresolved technical issues from the v3-v4 server move and the forum will remain on this temporary URL (with “/thepiazza” added in before “/bb”) until those are resolved. Once those are fixed, the forum will return to its normal URL.

If you have any problems logging in, pleasee post a message in the Facebook group for The Piazza and one of the moderators will give you advice:

https://www.facebook.com/groups/thepiazza/