Having now decided to go to the Brighton date instead (and unfortunately can't afford both)
I have 2 x seating tickets for sale - London O2 (Tues 29 March 2011)
Bought pre-sale - seats are close to stage - Upper Tier, Section 420, Row D, Seats 940-941
O2 seating plan here - http://www.theo2.co.uk/seating-plan/index.php?id=1551
Selling at face value - £30 each. Let me know if anyone's interested.