I got my tickets for the 02 on Sunday, but only after a bit of a hassle.
Tried booking using internet explorer, but despite using the correct links, it didn't give me the option to put in a pre-sale code, and it assumed I was trying to get them in the public sale, so it was saying no tickets available for any show.
It was only when I tried using Google Chrome, that it allowed me to enter my code.
Had a few panicky moments!
At least I'll know what to do when I try for tickets for the second show on Monday!