I would suggest that you should have applied some plain old common sense, instead of going into a self-obsessed rant about a simple translation issue...
Adult (18+) £215... Concession £215... Student £215...
Concessions: Customers must be either: State retirement age; Disabled client; Carer of disabled client. Proof of eligibility required on entry to Stadium.
Student: Student in full-time education (NUS card holder). Proof of eligibility required on entry to Stadium.
WHAT A COMPLETE JOKE... 🤣