Regarding seatwave, I bought 3 tickets from there for £80 each for one of the o2 dates, a week before the gig we got an email from seatwave saying the seller of the tickets had pulled out and we would get a full refund, needless to say me and my friends were extremely dissapointed especially after buying our first round from ukticketfactory... Resorted to camping the Musebay thread and managed to get some 2 hours before the gig but it was a lost of hassle no thanks to Seatwave.
Just thought it had to be said, just because you buy seatwave tickets it doesnt mean the tickets you bought are guarentee'd to reach you.
Also if you're buying on Musebay id recommend picking up the tickets a few days before the gig to avoid disappointment on the day, it has been known for people to lie as a wind up, thankfully we were lucky