Not trying to get too far ahead of myself here...but how do tickets for T20 Finals Day work?

I see that most of the tickets have gone already (probably to the people of the Birmingham area). Are there a set of tickets kept back for each team who makes it, for them to distribute? Or is it all open for everyone?

If there's none reserved for the finalists, then Glamorgan fans are likely to get 0 tickets (if we make it), as the other 3 finalists will know on Monday, Tuesday & Wednesday that their team will be there.