Tbh I cant see Wembley staff refusing people entry my ticket didnt work last year and they just glanced at it and let me inA number of people have said on here that they don't carry ID with them so don't know how this would work out. Quizzing them perhaps.
Be fuming if you had to go to ticket office when you have a valid ticket. I don't think anybody will be factoring in any additional time being required in case they get collared either.