Argh - postman has just been and no tickets today. Just cancelled our hotel booking for tonight in London (lost £50 deposit). Hope he's early with the post tomorrow although post time is usually around 1pm in my area. Have though been offered a ticket elsewhere by a kind NSC member who has 1 spare so might take that up.
I'd advise calling the ticket office, they'll add you to a duplicate list and Wembley will send you an email with print at home tickets instead. I did this today, as long as you call before 4pm you'll be fine and no need to queue at the ticket office tomorrow!