Miley cyrus concert london o2

[vvvodka]

dd wants to see this, and i am quite happy to take her but i have never bought tickets to a concert before. ive googled it, and lots of sites selling tickets have come up. can a mumsnetter please advise me on a legitimate site to buy them from.
tia

straight from the o2 site? make sure you don't get the really high up seats, they're scary!

lol, i didnt even think of that... [dufus emoticon] the plethora of websites that came up on google, and i couldnt see the o2 one

here it is