I am not sure how, but my Nook has arrived now. I ordered one and it didn't work, so I ordered another and I got a message saying it wouldn't be delivered either but then I got a courier tracking email.
I'm pleased it's here now anyway. The first thing I did was to root it and get some cool stuff on it. The process was very easy, I just followed this tutorial http://www.babblingengineer.com/how-to/how-i-turned-my-nook-into-an-e-reader-monster/
I then used this tutorial to put the Google stuff on it. http://forum.xda-developers.com/showthread.php?t=2086582
The next plan is to get Doom on it and hopefully do some sort of network Doom game with everyone else in the office who has got one of these Nooks for £29.