WOO! Hello, I'm one of the many lurkers who's now coming out of the woodwork. Seen Orbital a million and one times (OK, waaaaaaaay less than some forum members on here -- in fact, I can probably enumerate the gigs: couple of times at Brixton, three times at Glastonbury, once at Somerset House, once at Hammersmith Palais (RIP), once at V Festival... Uhhhm, crap, gotta be more than 8 times?!? Ah well, those are the ones that stick in the memory), and I'm ultra excited about this.
Just booked 4 tickets (put out a phone call to a mate from the days of the Somerset House gig, he's putting out calls, it'll end up being all the old faces

), and like a previous poster, I too was worrried a bit about the "all items are subject to availability" statement in the page I got after ordering. So I rang them up!

(Speaking to people on the phone -- it's the future!)
The nice woman at Record Store (0844 499 3456) confirmed for me that, assuming you've got through the payment section and been given an order reference number, that's it, you're going to see Orbital. Yay, and indeed, woo!

Don't swamp her with calls, but I put the number there just in case anyone's really paranoid.