Just a quick update, still to meet with G4S rep, scheduled this week, from info I have so far you should all know the roles you will be doing before you get to the venue.
I am still unsure how and when you will be assigned venues, but you will at some stage get Venue specific training, or should do at least.
Your accreditation at the UDAC should give you a clue.
All roles will be Security in one form or another and most customer facing, though there is jobs for Admin-y type bods at some venues.
Sorry if Ive repeated anything you knew already but will strive to find more asap