This is my first (and unfortunately somewhat selfish!) post on these forums.

I have a simple question that hopefully some of the users here (who have attended shows) can answer.
What time (if at all consistent) have U2 been taking the stage on this tour?
My reason for this question is that my fiance and I are fortunate enough to be arriving in London at noon on 15Aug2009 for the show to be held at Wembley that night.
We are arriving at approximately 11am local time and ticketmaster.co.uk shows the following time schedule:
Doors 16:00
Support (TBC) 17:30-18:00
Glasvegas 18:30-19:30
U2 20:00-22:30
Have U2 been consistently taking the stage that the quoted times or a bit later?
I have 2 friends (from UK and France) meeting me in London and (with an assigned seat) I don't want to show up needlessly early.
Any advice is much appreciated. Thanks.