There are equal numbers of male and female toilet blocks but some of these are "rebadged" depending on the event. Therefore a few of the "mens" toilets were actually the women's.
If people think Wembley was expensive to build, imagine how much it would have cost in the middle of London! You'd have to demolish half of WC1 to fit it in....
It's also untrue. The retracting roof is design to allow maximum levels of sunlight onto the pitch and the orientation of the ground was changed from old to new for the very reason of sunlight.
The Millennium Stadium is also tiny in comparison to new Wembley in terms of the size of the structure.