Tip ... when the booking is made via phone, they only take my QF# and never my +1 (I offer, they refuse).
So yesterday after booking made, I jumped into Manage My Bookings and updated my +1s QF#.
24 hrs later, no ticket issued.
I then rang back and queried. They explained because I "amended" the booking before the ticket was formally issued that "it had dropped off the issuance queue". The operator made a call to the ticketing office and said it would be issued today. And because it was any Any Seat ticket they take longer to issue.
So don't make any 'adjustments' to your booking until the ticket is formally issued it seems.