Does anyone know if we need an expo pass for this or will we be able to get in to see the show without one?

Ignore me. Just seen this in the Revision 3 forum:

"You are able to access the filming of Diggnation without any pass - so you don't have to purchase an expo pass. However, if you were interested in attending the expo, we have a limited amount rather than a set period for which we will have the early bird passes available. Therefore I could put some aside for you if you were interested.

Kindest regards,

Mel"

http://www.revision3.com/forum/showthread.php?p=182936#post182936

Shorted version of the above here - http://revision3.com/forum/showthread.php?t=8821

You can also buy a £5 ticket that will get you early access on the day :)

Bring them some good brit beer - they'll ship back what they don't drink!