Ta. Might look online to see if there's any photos to give an idea of views from different tiers/stands.
UPDATE: here it is! Useful
http://www.wembleystadium.com/plan-your-visit/stadium-guide/view-from-your-seat#
May be a daft question, but for anyone who has been to Wembley a few times;
Is there a big difference between being right at the back of the upper tier, and say, mid to lower part of the upper tier? Really don't want to have too shit a view but having to wait on buying tickets due to mates...