As there has been allot of questions surrounding valid ID for the Meet & Greet, the following applies
Any Identification containing
Photo of yourself
Your Name
these forms of Id are accepted, not limited to the following list:
Passport
Birth Cert
Driving license
Student Card
Library Card (provided it contains the above features)
and many many more
Photocopies of such ID is also valid, I.E if you decide to take a passport photocopy instead of the original this will be accepted
Tour goddess will be meeting the people and has been made aware of the above ID  Requirements, however chances are you wont be asked for it unless your look all shifty :P
Hope it puts some worried minds to rest
Love and Metal
Luke