Eactly why, during the match, Sussex Police should have sent along a bunch of vans and they should all have been rounded up and processed upon attempting to leave the Stadium. They haven't a hope in Hell of getting mnore than one or two of them after the fact. They'd have better luck playing...
When you witness how security is organised and carried out at venues and stadiums up and down the country it beggars belief more terrorist incidents don't occur. Most organisations or individuals don't have the first clue what security is or how to achieve it.