I would think 18000 – 20000 to go to the semi final. Last years finalists got 23500 each which would not need much working out if we sold less than this figure on how to sell cup final tickets.
Season ticket holders should again be allowed more per season ticket but should be restricted to 2 each which allows them to take family to the game as they are the semi final. I for example don’t have a season ticket but I bet I have been to more away games than 90% of season ticket holders this and other seasons.
The sale should then go to those able to produce a stub from the semi final and then the remainder on general sale after that.
If we take above 23500 to wembley then I suppose thats my theory done in but I doubt very much we would take more than 18-20k to wembley.