So, I successfully nabbed some £70 level 1 tickets for London. So far so good.
When I was selecting them, I was a bit unsure of exactly where they were (apart from on level 1). The interactive seating map on the AXS website was good at showing the location of the stupidly-priced tickets at the side, and some of the level 4 cheap seats, but the £70 level 1 tickets' location was not shown. But I took a punt anyway (as I didn't want to shell out for the super-expensive tickets, but the last time I got the cheapest tickets for U2 at the O2 the seats and view were terrible).
Anyway, it tu