Definitely less than 35K Albion at all our previous big days out.
The only gathering of Albion fans that challenges this Saturday for number is the Fulham game at The Goldstone. 36,747 in the ground. But Fulham were chasing promotion and will have brought a good number down from London - logically the fact that the crowd was so unusually high compared to others that season suggests that they did.
There will be MORE than 35,000 Albion there Saturday, too.
If these last few sell, than that is what we have officially sold. Probably fair to assume close to another 1,000 in the neutral / club Wembley / corporate sections, either blagged through work, through contacts, or bought through resale sites.