The sale is open to non ambassadors and non season ticket holders who have attended at least 5 home games this season upto and including tickets purchased for the postponed Derby game.
The club will check the booking history on their database to prove that you qualify and if you have purchased your individual match tickets from the ticket booths you will need to have the stubs from all the games you attended. All stubs must have the same name. Mix and match stubs will not be accepted.
Full details can be found here on the official website.